Multiple
Choice
Identify
the letter of the choice that best completes the statement or
answers the question.
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1.
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The
“father” of genetics was
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a.
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T. A. Knight.
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c.
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Gregor Mendel.
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b.
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Hans
Krebs.
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d.
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None
of the above
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2.
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Mendel
obtained his P generation by allowing the plants to
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a.
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self-pollinate.
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c.
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assort
independently.
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b.
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cross-pollinate.
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d.
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segregate.
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3.
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What
is the probability that the offspring of a homozygous dominant
individual and a homozygous recessive individual will exhibit the
dominant phenotype?
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a.
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0.25
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c.
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0.66
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b.
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0.5
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d.
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1.0
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4.
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True-breeding
pea plants always
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a.
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are pollinated by hand.
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b.
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produce
offspring with either form of a trait.
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c.
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produce offspring with only one form of a trait.
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d.
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are heterozygous.
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5.
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The
first filial (F1)
generation is the result of
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a.
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cross-pollination
among parents and the next generation.
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b.
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crosses
between individuals of the parental generation.
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c.
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crosses between the offspring of a parental cross.
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d.
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self-fertilization between parental stock.
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6.
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Which
of the following is the designation for Mendel’s original pure
strains of plants?
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7.
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A
genetic trait that appears in every generation of offspring is
called
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a.
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dominant.
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c.
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recessive.
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b.
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phenotypic.
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d.
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superior.
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8.
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To
describe how traits can disappear and reappear in a certain pattern
from generation to generation, Mendel proposed
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a.
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the
law of independent assortment.
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b.
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the law of segregation.
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c.
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the
law of genotypes.
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d.
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that the F2
generation will only produce purple flowers.
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9.
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When
Mendel crossed pea plants with two contrasting traits, such as
flower color and plant height,
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a.
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these
experiments led to his law of segregation.
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b.
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he found that the inheritance of one trait did not influence the
inheritance of the other trait.
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c.
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he found that the inheritance of one trait influenced the inheritance of
the other trait.
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d.
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these experiments were considered failures because the importance of his
work was not recognized.
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10.
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If
an individual has two recessive alleles for the same trait, the
individual is said to be
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a.
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homozygous
for the trait.
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c.
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heterozygous
for the trait.
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b.
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haploid for the trait.
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d.
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mutated.
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11.
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An
individual heterozygous for a trait and an individual homozygous
recessive for the trait are crossed and produce many offspring that
are
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a.
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all the same genotype.
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c.
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of three different phenotypes.
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b.
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of
two different phenotypes.
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d.
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all
the same phenotype.
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In
humans, having freckles (F) is dominant to not having freckles (f).
The inheritance of these traits can be studied using a Punnett
square similar to the one shown below.
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12.
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Refer
to the illustration above. The genotype represented in box “1”
in the Punnett square would
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a.
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be
homozygous for freckles.
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b.
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have an extra freckles chromosome.
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c.
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be
heterozygous for freckles.
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d.
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have freckles chromosomes.
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13.
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Refer
to the illustration above. The genotype in box “3” of the
Punnett square is
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a.
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FF.
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c.
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ff.
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b.
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Ff.
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d.
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None of the above
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14.
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How
many different phenotypes can be produced by a pair of codominant
alleles?
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15.
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Refer
to the illustration above. The phenotype represented by the cell
labeled “1” is
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a.
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green,
inflated.
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c.
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yellow,
inflated.
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b.
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green, constricted.
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d.
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yellow, constricted.
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16.
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2,000
yellow seeds : 8,000 total seeds ::
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a.
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1 : 6
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c.
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1 : 3
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b.
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1
: 8
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d.
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1
: 4
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In
rabbits, black fur (B) is dominant to brown fur (b). Consider the
following cross between two rabbits.
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17.
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Refer
to the illustration above. Both of the parents in the cross are
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a.
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black.
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c.
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homozygous
dominant.
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b.
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brown.
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d.
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homozygous recessive.
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18.
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Refer
to the illustration above. The phenotype of the offspring indicated
by box “3” would be
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a.
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brown.
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c.
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a
mixture of brown and black.
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b.
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black.
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d.
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The phenotype cannot be determined.
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19.
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What
is the expected phenotypic ratio resulting from a homozygous
dominant ´
heterozygous monohybrid cross?
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a.
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1:3:1
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c.
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2:1
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b.
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1:2:1
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d.
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1:0
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20.
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Refer
to the illustration above. The phenotype represented by the cell
labeled “1” is
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a.
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round,
yellow.
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c.
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wrinkled,
yellow.
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b.
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round, green.
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d.
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wrinkled, green.
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21.
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An
organism that has inherited two of the same alleles of a gene from
its parents is called
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a.
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hereditary.
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c.
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homozygous.
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b.
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heterozygous.
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d.
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a mutation.
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22.
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In
pea plants, yellow seeds are dominant over green seeds. What would
be the expected genotype ratio in a cross between a plant with green
seeds and a plant that is heterozygous for seed color?
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a.
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1:3
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c.
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4:1
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b.
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1:2:1
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d.
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1:1
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23.
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codominance
: both traits are displayed ::
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a.
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probability
: crosses
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b.
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heterozygous : alleles are the same
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c.
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homozygous
: alleles are the same
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d.
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Punnett square : chromosomes combine
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24.
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The
difference between a monohybrid cross and a dihybrid cross is that
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a.
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monohybrid
crosses involve traits for which only one allele exists,
while dihybrid traits involve two alleles.
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b.
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monohybrid crosses involve self-pollination, while dihybrid crosses
involve cross-pollination.
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c.
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monohybrid crosses involve one gene; dihybrid crosses involve two genes.
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d.
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dihybrid crosses require two Punnett squares; monohybrid crosses need
only one.
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25.
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What
fraction of the offspring resulting from a heterozygous ´ heterozygous dihybrid cross are heterozygous for both traits?
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a.
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9/16
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c.
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3/16
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b.
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1/4
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d.
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1/16
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