In garden peas,one pair of alleles controls the height of the plant,and a second pair of alleles controls flower color.The allele for tall (D)is dominant to the allele for dwarf (d),and the allele for purple (P)is dominant to the allele for white (p).A tall plant with purple flowers crossed with a tall plant with white flowers produces 3/8 tall purple,1/8 tall white,3/8 dwarf purple,and 1/8 dwarf white.What is the genotype of the parents?
A) Dd Pp x Dd pp
B) Dd Pp x Dd Pp
C) DD Pp x dd Pp
D) Dd pp x dd Pp
E) DD Pp x dd pp

Question

In garden peas,one pair of alleles controls the height of the plant,and a second pair of alleles controls flower color.The allele for tall (D)is dominant to the allele for dwarf (d),and the allele for purple (P)is dominant to the allele for white (p).A tall plant with purple flowers crossed with a tall plant with white flowers produces 3/8 tall purple,1/8 tall white,3/8 dwarf purple,and 1/8 dwarf white.What is the genotype of the parents?  
A) Dd Pp x Dd pp
B) Dd Pp x Dd Pp
C) DD Pp x dd Pp
D) Dd pp x dd Pp
E) DD Pp x dd pp

Quizplus · Accepted Answer

The given offspring ratios suggest that each trait is segregating independently, and both parents must contribute both dominant and recessive alleles for each trait. The only option that allows for all observed phenotypes in the offspring is A) Dd Pp x Dd pp, where one parent contributes the alleles for both tall and dwarf as well as purple and white flowers, and the other parent contributes alleles for tall and dwarf but only white flowers.

In Garden Peas,one Pair of Alleles Controls the Height of the Plant,and