In duroc jersey hog, the coat colour is dependant on two pairs of alleles, R and r and S and s. Any genotype containing at least one R-gene and at least one S-gene results in red coat colour.The double recessive genotype results in white coat colour. All other genotypes results in sandy coat colour. If one hog with genotype "RrSs" mated with another hog with geno type "rrss" what kind of offsprings will be produced by above cross :-a)9 red : 6-sandy : 1 whiteb)9 red : 3-sandy : 4 whitec)12 red : 3-sandy : 1 whited)1 red : 2-sandy : 1 whiteCorrect answer is option 'D'. Can you explain this answer?

Question

In duroc jersey hog, the coat colour is dependant on two pairs of alleles, R and r and S and s. Any genotype containing at least one R-gene and at least one S-gene results in red coat colour.The double recessive genotype results in white coat colour. All other genotypes results in sandy coat colour. If one hog with genotype &#34;RrSs&#34; mated with another hog with geno type &#34;rrss&#34; what kind of offsprings will be produced by above cross :-a)9 red : 6-sandy : 1 whiteb)9 red : 3-sandy : 4 whitec)12 red : 3-sandy : 1 whited)1 red : 2-sandy : 1 whiteCorrect answer is option 'D'. Can you explain this answer?

Answer

Explanation:

In this question, we are given two pairs of alleles(R and r) and (S and s) which determine the coat color of Duroc Jersey Hog. The genotype containing at least one R-gene and at least one S-gene results in red coat color. The double recessive genotype results in white coat color and all other genotypes result in sandy coat color.

Given genotypes of parents:
RrSs x rrss

Here, RrSs and rrss are the genotypes of parents. Let's write down the possible gametes of each parent.

Possible gametes of RrSs parent:
RS, Rs, rS, rs

Possible gametes of rrss parent:
rs, rs, rs, rs

Now, we can use Punnett square to find out the possible genotypes and phenotypes of offspring.

Punnett Square:
____________R__r
S| RS | rS |
s| Rs | rs |

Possible genotypes of offspring:
RS, rS, Rs, rs, rs, rs, rs, rs, rs

Possible phenotypes of offspring:
Red(RRSS, RrSS, RRss, Rrss), Sandy(RrSs), White(rrss)

Therefore, the expected offspring from the given cross is:
1 Red : 2 Sandy : 1 White

Hence, option 'D' is the correct answer.

Answer

Genotypes of parent is RrSs and rrss

RrSs (red parents); gametes produced will be of four types RS, Rs, rS and rS

rrss (white parent) can produce gametes of one type only rs

therefore RrSs x rrss , yields

RrSs: Rrss: rrSs: rrss

red: sandy: sandy: white

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