Chromosomes & Human Inheritance
All Materials Cmassengale

Chromosomes:

Chromosome Numbers:

Diploid (2n) numbers of Organisms

Man

46

Dog

78

Fruitfly

8

Crayfish

200

Corn

20

Pedigrees:

 

Sex Linkage:


Mutant White-eyed  & Wild, Red-eyed 

Royal Pedigree

Example Sex-Linked Problems:

    1. What are the results of crossing a colorblind male with a female carrier for colorblindness?

Trait:     Red-Green Colorblindness

Alleles:     XC    normal vision
                 Xc    colorblindness

XCXc       x    Xc Y

  XC Y   Genotypes:    XCXC ,XCY, XCXc, XcY
XC XCXC XCY   Genotypic Ratio: 1:1:1:1
Xc XCXc XcY   Phenotypes:
normal vision female, normal vision male, female carrier, colorblind male

     2. What are the results of crossing a colorblind male with a colorblind female? 

 

Trait:     Red-Green Colorblindness

Alleles:     XC    normal vision
                 Xc    colorblindness

XcXc       x    Xc Y

  Xc Y   Genotypes:       XcXc , Xc
Xc XcXc XcY    Genotypic Ratio: 1:1 ratio
Xc XcXc XcY   Phenotypes:       colorblind female, colorblind male
   Phenotypic ratio:  1:1 ratio

 

Linked genes:

Chromosome Mapping:

Number of recombinants x 100%

Recombination Frequency

=  

---------------------------------------------
     Total Number of Offspring

    Chromosome Mutations:

Gene Mutations:

Frame shift mutation

point mutation