In rats, at least 2 different genes interact to determine hair color. The allele A causes...
In rats, at least 2 different genes interact to determine hair color. The allele A causes a yellow-colored coat and the allele R produces a black coat. If both dominant alleles are present (genotype A-R) the rats are gray, and if none are present (aarr) the rats are cream-colored.
a. If two heterozygous gray rats are mated and have 16 babies, show the expected number of babies of each color.
b. If a heterozygous gray rat is mated with cream-colored rat, show the expected proportion of colors of the offspring.
Homework Answers
a.AaRr x AaRr
| AR | Ar | aR | ar | |
| AR | AARR | AARr | AaRR | AaRr |
| Ar | AARr | AArr | AaRr | Aarr |
| aR | AaRR | AaRr | aaRR | aaRr |
| ar | AaRr | Aarr | aaRr | aarr |
grey - AARR(1) , AARr (2) , AaRR (2), AaRr (4) , total -9
Yellow - Aarr (3)
Black - aaRR(1), aaRr(2), total -3
cream - aarr(1)
Thus the ratio obtained is 9:3:3:1 of Grey : yellow : Black : cream
b. AaRr x aarr
Gametes- AR, Ar, aR, ar from "AaRr " and all "ar" from aarr.
| AR | Ar | aR | ar | |
| ar | AaRr | Aarr | aaRr | aarr |
AaRr - Grey 1/4 or 25%
Aarr - Yellow 1/4 or 25%
aaRr - Black 1/4 or 25%
aarr - Cream 1/4 or 25%
Thus the ratio obtained is- grey:yellow: black : cream = 1:1:1:1
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