Griffith’s Experiment
Category: Resources
Genetic Traits Activity
| Finding Your Genetic Match |
Introduction:
Have you ever noticed that brothers or sisters often look alike? Their inherited traits are what make their physical appearance so similar. An inherited trait is a particular genetically determined characteristic that distinguishes a person. The traits of children are determined by the traits that are passed on from their parents. Some traits are obvious in a family — a child’s nose is shaped like their mother’s nose, but some traits are less obvious. You may have similar traits to many of your classmates even though you are not related to them. Some examples of often un-noticed human traits are the ability or not to roll your tongue, attached or unattached earlobes, dimples or freckles, naturally curly or straight hair, hitchhiker’s or straight thumb, straight or widow’s peak hairline, smooth or cleft chin, or colorblindness or normal vision.
There are numerous traits in humans, but some traits occur more frequently than others. Between 70-90% of the human population have free-hanging earlobes, can roll their tongue, are right-handed, and can taste a chemical called PTC. These traits are called high frequency traits.
Objective:
Students will determine the presence of certain high frequency traits in themselves & their classmates.
Materials:
Genetic Inventory sheet with pictures, paper, pencil, PTC taste strips.
Procedure:
- Identify which of the following 10 human traits you have by placing a check mark beside that trait.
- Compare the traits you have with other students in the classroom and find the student you most closely match.
| Human Trait Inventory | |
| Student: | |
| Tongue Roller | |
| Non-Tongue Roller | |
| Attached Earlobes | |
| Unattached earlobes | |
| Dimples | |
| No Dimples | |
| Right-handed | |
| Left-Handed | |
| Widow’s Peak | |
| Straight Hairline | |
| Left Thumb on top when Hands Crossed | |
| Right Thumb on top when Hands Crossed | |
| Hair on mid-digit of hand | |
| No hair on mid-digit of hand | |
| Bent little finger | |
| Straight little finger | |
| Second toe longer than big toe | |
| Second toe not longer than big toe | |
| Can Taste PTC | |
| Can Not Taste PTC | |
| Vulcan (Fingers spread 2 by 2) | |
| None Vulcan | |
| Class Match: | |
| Tongue Roller | Non Roller | Dimples | No Dimples |
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| Attached Earlobes | Unattached Earlobes | Widow’s Peak | Straight Hairline |
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| Longer Second Toe | Short Second Toe | Bent Little finger | Hitchhiker’s Thumb |
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| Attached Ear lobes (left) Unattached ear Lobes (right) |
“VULCAN” or No “VULCAN” | Dimples | Right/Left Thumb on top |
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Genetics PPT Questions
| Mendelian Genetics PowerPoint Questions |
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| Gregor Mendel
1. Who is responsible for our laws of inheritance? 2. What organism did Mendel study? 3. When was Mendel’s work recognized? 4. When did Mendel perform his experiments & how many plants did he grow? 5. What did Mendel notice about offspring traits? 6. How is Mendel referred to today? 7. In what country did Mendel do his research on peas? 8. Mendel stated that physical traits were inherited as _______________. 9. Today we know that particles are actually what? Terminology 10. Define these three terms:
b. heredity – c. genetics –
11. Name & describe two types of genetic crosses.
12. What is used to solve genetic crosses? 13. Sketch a Punnett square & show how they are used to solve a genetics problems.
14. Use a Punnett square to solve a cross between two parents that both have the genotype Yy.
15. What are alleles & what are the two forms?
16. Explain the difference between dominant & recessive alleles.
17. Using a letter of the alphabet, show how each allele would be represented.
18. What is a genotype and write 3 possible genotypes?
19. What is a phenotype and write possible phenotypes for your genotypes in question 18?
20. Using these alleles, R = red flower and r = yellow flowers, write all possible genotypes & phenotypes.
21. What are homozygous genotypes?
22. Write a homozygous dominant genotype. 23. Write a homozygous recessive genotype. 24. What is meant by a heterozygous genotype?
25. Write a heterozygous genotype. 26. Heterozygous genotypes are also called _____________. 27. What two things actually determine an organism’s characteristics? Pea Experiments 28. Give 4 reasons that Mendel used garden peas, Pisum sativum, for his experiments.
29. Name the male and female parts of a flowering plant and explain how pollination occurs.
30. What is the difference between self and cross pollination?
31. Explain how Mendel cross pollinated his pea plants.
32. How did Mendel get pure plants? 33. Name 8 pea plant traits and give the dominant & recessive form of each.
34. How did Mendel’s experimental results compare to the theoretical genotypic ratios? Explain.
35. What does P1 mean? 36. What is the F1 generation? 37. What is the F2 generation? 38. What results from this cross — TT x tt? 39. What results do you get from crossing two hybrids (Tt x Tt)?
40. Show all your work for solving a P1 monohybrid cross for seed shape. P1 cross: __________ x __________ Genotype ____________
41. The offspring of the above cross are called the _____ generation. 42. Show all your work for solving a F1 monohybrid cross for seed shape. F1 cross: __________ x __________ Genotype ____________ 43. Show all your work for solving both F2 monohybrid crosses for seed shape. Trait: F2 cross: ________ x ________ F2 cross: ________ x ________
Genotype ____________ Genotype ____________ Mendel’s Laws Complete the following question: 44. _________ are responsible for inherited traits. 45. Phenotype is based on _______________. 46. Each trait requires _____ genes, one from each ____________. 47. State the Law of Dominance and give an example.
48. State the Law of Segregation and tell when alleles are “recombined”.
49. State the Law of Independent assortment & tell what type of crosses show this.
50. Using the formula 2n where n = the number of heterozygotes, tell how many gametes will be produced by each of the following allele combinations: 51. What are the possible allele combinations in the egg and sperm from the following cross — RrYy x RrYy.
52. Show how to work an F1 dihybrid cross for seed shape & seed color. Traits:
F1 cross __________ x __________
GR Genotypes PR Phenotypes
53. Complete this cross or crosses for eye color & curliness of the hair — bbC__ x bbcc.
54. Draw a table summarizing Mendel’s 3 laws.
Incomplete and Co-Dominance 55. Incomplete dominance occurs in __________ and produces a phenotype _______________ the phenotype of the two parents. 56. Show your work solving a cross for flower color in snapdragons when there is incomplete dominance. Trait: Cross: RR x rr
Genotype ____________ 57. What is codominance & give an example?
58. Write the genotypes for each of these blood types: type A 59. Solve this codominance problem: IBIB x IAi.
60. Solve this codominance problem for blood type: ii x IAIB.
Sex-Linked Traits 61. What are sex linked traits?
62. Name the sex chromosomes. 63. Write the genotype for male and for female. 64. Most sex-linked traits are carried on what chromosome? 65. Give an example of a sex-linked trait in fruit flies. 66. Show the results of crossing a red-eyed male (XRY) with a white-eyed female (XrXr) fruit fly. Cross: __________ x __________
Genotype ____________ 67. What is meant by a female carrier?
68. Name a disease that can be carried in this manner.
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Enzyme PowerPoint Worksheet
Enzymes
ppt Questions
Enzyme Structure & Function
1. Most enzymes are what type of macromolecule?
2. Most enzymes are ______________ or ______________ structures.
3. Enzymes act as ___________ in reactions.
4. Are enzymes permanently changed in the chemical reactions they are involved in?
5. Will an enzyme work on any substance? Explain.
6. Can enzymes be reused?
7. What ending is found on many enzymes?
8. Give 3 examples of enzymes with this ending.
9. How does an enzyme work?
10. What effect does an enzyme have on activation energy needed to start a reaction?
11. Hydrogen peroxide H2O2 is a common waste product of cells. Enzymes called catalases in cells break this down into harmless ________________.
12. What is meant by the term substrate?
13. What is meant by active site?
14. Sketch and label the enzyme-substrate complex.
15. What is meant by induced fit?
16. What induces an enzyme to change the shape of its active site?
17. List 4 factors that can affect enzyme activity.
18. What is the effect of high temperature on an enzyme (running fever)?
19. What temperature do most enzymes do best at?
20. Most enzymes like a pH near ______________.
21. To denature an enzyme means the enzyme becomes _______________ and can no longer work properly.
22. Name 3 inorganic substances (cofactors) that are often needed for enzymes to work properly.
23. Give an example of an enzyme & its needed inorganic substance.
24. Give one example of an enzyme inhibitor.
25. Explain how competitive inhibitors work.
26. If a competitive inhibitor blocks the active site, the ____________ can’t fit.
27. Explain noncompetitive inhibitors.
28. Do noncompetitive inhibitors bind to the active site? Explain.
Evolution BI Worksheet
| EVOLUTION |  |
Section 14-1 Biogenesis
1. Define biogenesis.
2. What is spontaneous generation & give an example. Can spontaneous generation occur?
3. Describe Redi’s experiment and its results.
4. Describe Spallanzani’s experiment and its results.
5. Did Redi & Spallanzani’s experiments disprove spontaneous generation? Explain.
6. Describe Pasteur’s experiment and its results. Did it prove or disprove spontaneous generation?
Section 14-2 Earth’s History
7. What is the estimated age of the earth?
8. a. What is radioactive dating, and how is it used to tell the age of materials?
b. Use a science dictionary to look up and explain relative dating of fossils.
9. What is meant by half-life?
10. Name 3 radioactive isotopes and give their half-life.
11. a. What 2 scientists set up an experiment that simulated the atmosphere of early earth?
b. What molecules were made during this experiment?
Section 14-3 The First Life Forms
12. Why was there no oxygen in the early atmosphere?
13. Were the 1st cells probably aerobic or anaerobic? Why?
14. What gases did the early atmosphere contain primarily?
15. What bacteria live in harsh environments containing methane gas?
16. Oxygen didn’t become part of our atmosphere until what process started taking place?
Section 15-1 Fossil Record
17. What is a fossil?
18. In what type of rock are fossils usually found?
19. What is sedimentary rock?
20. From what part or parts of organisms do sedimentary fossils usually form?
21. How do sedimentary fossils form?
22. How do casts form?
23. What do you call imprint fossils?
24. Complete insect fossils can be found inside of a clear, golden material called ________________.
25. Who was one of the first scientists to study fossils?
26. In which rock layer or strata would the oldest fossils be found? The newest fossils?
27. Name the 4 eras of earth’s history in order beginning with the oldest & going to present day.
28. Which organisms appeared first in earth’s history?
29. Name the period in which each of these events occurred:
a. Humans appeared?
b. Mass extinction of dinosaurs?
c. Land plants appeared?
d. Birds appeared?
e. Fish appeared?
f. Reptiles appeared?
g. Modern mammals appeared?
30. What is true about fossils in the same rock layer or strata?
31. a. What is meant by mass extinction and give an example?
b. Has there been more than one mass extinction in earth’s history? Explain.
32. Radioactive isotopes are used to determine the ___________________ age of fossils.
Section 15-2 Theories of Evolution
33. What was Lamarck’s hypothesis about how species change?
34. What is meant by acquired trait?
35. What did Lamarck think had caused the webbed feet of water birds?
36. How did Lamarck think the offspring of these web-footed birds got their web-feet?
37. Can traits be passed in this way? Explain why or why not.
38. Was Lamarck’s idea of acquired traits proven or rejected?
39. Charles Darwin’s idea of how species change over time is called what?
40. Explain natural selection.
41. What other scientist came up with this same idea about evolution?
42. What was the name of the book that Darwin published with his ideas about evolution?
43. Explain how Darwin obtained all of his records & supporting evidence that led him to his theory of natural selection.
44. Describe the voyage of the H.M.S. Beagle.
45. What book did Darwin read that influenced his ideas when he sailed on the Beagle? Who was the author?
46. What unusual information did Darwin collect about the Galapagos finches on his voyage?
47. What forced Darwin to move ahead and publish his ideas?
48. State the 2 theories that sum up Darwin’s ideas about evolution & natural selection.
49. State Darwin’s Descent with Modification theory.
50. Darwin’s theory stated that all the Galapagos finches had descended from what?
51. State Darwin’s Modification by Natural Selection theory.
52. What idea, published in a book by Thomas Malthus, did Charles Darwin use?
53. According to Darwin, what limits the growth of populations?
54. How do populations of organisms adapt to their environment?
55. What is meant by the fitness of an organism?
Section 15-3 Evolution in Process
56. What are homologous structures and give an example?
57. What are analogous structures & give an example?
58. Which structures, homologous or analogous, show that organisms are more closely related?
59. What are vestigial structures & give an example?
60. Vestigial structures show __________________________ ancestry.
61. In the early stages, how do all vertebrate embryos compare with each other? What does this indicate?
62. Organisms with homologous (similar) _________________ & __________________ acids are probably more closely related.
63. What is co-evolution & give 2 examples of organisms that co-evolve?
64. Are a shark and a porpoise closely related? Explain your answer.
65. When does convergent evolution occur?
66. What is divergent evolution?
67. Divergent evolution usually results in new ________________________.
68. What is adaptive radiation & give an example?
69. How can adaptive radiation be sped up & give an example?
Section 16-1 Genetic Equilibrium
70. Do populations change quickly or slowly?
71. What is the study of evolution using genetics called?
72. Do individuals evolve?
73. Do populations evolve?
74. Variations in traits may be due to ___________________ factors or __________________.
75. Name the 3 ways variations in genotypes arise.
76. What is meant by the gene pool?
77. How many alleles exist for each trait in a gene pool?
78. How is allele frequency determined?
79. Determine the frequency of each allele in the following genotypes:
a. AA?
b. Aa?
c. aa?
80. How is phenotypic ratio determined?
81. What is the phenotypic frequency of white, pink, & red four-o-clocks in these crosses?
a. RR x rr ?
b. Rr x Rr ?
c. Rr x rr ?
82. The frequency of alleles or phenotypes in a cross must always add up to ______________.
83. What does the Hardy-Weinberg theory state about allele frequencies in a population?
84. List the 5 conditions that must hold true in the ideal population for Hardy-Weinberg to be correct.
85. Would the Hardy-Weinberg law apply to real populations?
Section 16-2 Disruption of Genetic Equilibrium
86. What effect does evolution have on a population’s genetic material?
87. Does evolution affect allele frequencies?
88. Any violations of the 5 conditions necessary for Hardy-Weinberg can result in _____________.
89. A change in genetic material is known as a _______________________.
90. Mutations occur constantly at _______________ rates unless an organism is exposed to ___________.
91. Most mutations are __________________, but some may be _____________________ & help the population evolve & survive.
92. Compare & contrast population immigration & emigration.
93. What is gene flow & give an example?
94. Does the Hardy-Weinberg law apply to small and medium sized populations?
95. What is genetic drift?
96. In what size populations does genetic drift apply & explain why?
97. Do all populations mate randomly? Explain.
98. What is the effect of matings of related individuals?
99. What is the most significant factor that affects genetic equilibrium?
100. Name the 4 types of natural selection & explain each.
a.
b.
c,
d.
101. Give an example of stabilizing selection using body size of lizards.
102. Give an example of directional selection using tongue length of anteaters.
103. Give an example of disruptive selection using limpets.
104. Explain the following — “genes of successful reproducers, rather than those of successful survivors, are amplified through natural selection.”
Section 16-3 Formation of Species
105. Do new species ever form? Do old species ever disappear? Explain your answer.
106. Define speciation.
107. Are all new species similar to their ancestral species? Explain.
108. What did scientists use for many years to help classify organisms?
109. What is morphology?
110. What are some limitations of using only morphology to identify organisms?
111. What is the biological species concept?
112. Does this concept help identify extinct species & why?
113. Members of a species are _________________similar & can __________________ to produce _____________________ offspring.
114. What does speciation begin with & does it affect mating?
115. Name 2 important types of isolation.
a.
b.
116. Define geographic isolation.
117. Give an example of how this type of isolation could occur.
118. What happens to the 2 subgroups after being geographically isolated from each other?
119. Define reproductive isolation.
120. Name & describe the 2 types of reproductive isolations.
a.
b.
121. Not recognizing mating calls or having different breeding times are examples of what type of isolation?
122. An infertile mule produced when a donkey and a horse mate is an example of ______________________ isolation.
123. Speciation often requires ______________________ of years.
124. Can some species form more quickly than others? Explain.
125. Does fossil record support a slow, gradual or more “instant” change in species?
126. A more “instant” formation or change occurs in ___________________, not millions of years.
127. What is this type of quicker species formation called?
128. What does punctuated equilibrium mean?