Question

In poultry, feathered legs are dominant over clean legs. Show all possible genotypes of the parents in each of t following cases: 21 offspring have feathered legs, 7 have clean legs

Answer 1

In poultry, feathered legs are dominant over clean legs. The possible genotypes of the parents, based on the number of offspring with feathered legs and clean legs, are FF x FF, FF x Ff, FF x ff, Ff x Ff, Ff x ff, and ff x ff.

Step-by-step explanation:

The parents in this case must have different combinations of the feathered legs and clean legs alleles. Let's represent the feathered legs allele as F and the clean legs allele as f. Since feathered legs are dominant over clean legs, individuals with the genotype FF or Ff will have feathered legs, while individuals with the genotype ff will have clean legs.

Given that 21 offspring have feathered legs and 7 have clean legs, we can set up a Punnett square to find the possible genotypes of the parents:

• FF x FF: All offspring will have feathered legs (genotype FF).
• FF x Ff: 50% of the offspring will have feathered legs (genotype FF) and 50% will be carriers with feathered legs (genotype Ff).
• FF x ff: All offspring will have feathered legs (genotype Ff).
• Ff x Ff: 75% of the offspring will have feathered legs (genotype FF or Ff) and 25% will have clean legs (genotype ff).
• Ff x ff: 50% of the offspring will have feathered legs (genotype Ff) and 50% will have clean legs (genotype ff).
• ff x ff: All offspring will have clean legs (genotype ff).

Therefore, the possible genotypes of the parents in this case are FF x FF, FF x Ff, FF x ff, Ff x Ff, Ff x ff, and ff x ff.