Question

a cross between two heterozygous parents (Pp) gives which of the following expected genotypes of progeny? (a)all Pp (b) 1pp:3 PP (c) 3Pp: 1 pp (d) 1 PP : 2 Pp : 1 pp ​

Answer 1

hence the correct answer is d.

Answer 2

Answer:

The correct answer is d) 1 PP : 2 Pp : 1 pp ​

Explanation:

If there is a cross between heterozygous parents(Pp) then during gametogenesis the gamete will segregate according to law of segregation as P and p of the male parent and P and p of the female parent.  

Then one of the alleles from male parent one from female parent will combine to form the genotype of the offspring. Therefore, the four possible combinations would be PP, Pp, Pp, and pp.

So the genotype ratio would be 1(PP): 2(Pp): 1(pp) and phenotype ration would be 3:1 because 3 of 4 offspring contains dominant allele i.e, P. So the right answer is d) 1 PP: 2 Pp: 1 pp.