Extensions to Mendel Video Lessons

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Problem: Coat color in mice is controlled by many genes, four of which we will consider. The gene C permits pigment deposition in the fur, whereas cc causes albinism. The gene B causes black pigmentation, whereas bb results in brown fur. The gene A causes deposition of a narrow band of yellow pigment near the tips of individual hairs, a condition called "black agouti" in black animals and "cinnamon" in brown animals; the genotype aa causes no yellow banding of hairs. The genotype dd causes a dilution of fur color (unless the fur color is already albino); the gene D has no effect on coloration at all. All of these genes are located on different autosomes. You cross a female mouse with genotype CcBbaaDd to a male mouse with genotype CcbbAaDd. The cross produces 10,000 offspring.What color coat does the female parent have?What color coat does the male parent have?Complete the following table by indicating the number of mice with each different phenotype.Remember there is no such thing as partial mouse so round number properly to the nearest whole number. List the different genotypes of dilute cinnamon offspring that could be produced in the above cross.

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Coat color in mice is controlled by many genes, four of which we will consider. The gene C permits pigment deposition in the fur, whereas cc causes albinism. The gene B causes black pigmentation, whereas bb results in brown fur. The gene A causes deposition of a narrow band of yellow pigment near the tips of individual hairs, a condition called "black agouti" in black animals and "cinnamon" in brown animals; the genotype aa causes no yellow banding of hairs. The genotype dd causes a dilution of fur color (unless the fur color is already albino); the gene D has no effect on coloration at all. All of these genes are located on different autosomes. You cross a female mouse with genotype CcBbaaDd to a male mouse with genotype CcbbAaDd. The cross produces 10,000 offspring.

What color coat does the female parent have?
What color coat does the male parent have?
Complete the following table by indicating the number of mice with each different phenotype.

Remember there is no such thing as partial mouse so round number properly to the nearest whole number. 

List the different genotypes of dilute cinnamon offspring that could be produced in the above cross.

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