Question

In foxes, silver coat (r) is recessive to red coat (R). Two foxes are mated. One of the parent foxes has a red coat and one has a silver coat. The litter that results contains four red-coat and three silver-coat kits.
(a) What is the genotype of the red-coat parent?
(b) What is the genotype of the silver-coat parent?
(c) What are the genotypes of the offspring?
(d) Did segregation of alleles occur?
(e) Did independent assortment of alleles occur?

Answer 1

Answer:

Genotypes of parents are Rr and rr.

Explanation:

A homozygous fox would have either two dominant alleles (RR) or two recessive alleles (rr).  

A heterozygous fox would have a mix of both one dominant allele and one recessive allele (Rr).

However, a heterozygous fox can only be red, as the (Rr) combination will make it so that the dominant red coat trait will rule over the recessive allele.

(a).  as given that f 1 generation are 4 red and 3 white , so RED coat can not be homozygous dominant , So red coat will be Rr (heterozygous dominant).

(b). silver coat is recessive homozygous , rr

(c).  genotypes of offspring  Rr, Rr, rr, rr.

(d) yes

(e) yes