Question

Strains of petunias come in four pure-breeding colors: white, blue, red, and purple. White petunias are produced when plants synthesize no flower pigment. Blue petunias and red petunias are produced when plants synthesize blue or red pigment only. Purple petunias are produced in plants that synthesize both red and blue pigment.

The mixture of red and blue makes purple. Flower-color pigments are synthesized by gene action in two separate pigment-producing biochemical pathways. Pathway I contains gene A that produces an enzyme to catalyze conversion of a colorless pigment designated White 1 to blue pigment. In Pathway II, the enzymatic product of gene B converts the colorless pigment designated White 2 to red pigment. The two genes assort independently.
Part A: What are the possible genotype(s) for pure-breeding red petunias?
AABB
AABb
Aabb
AaBb
aaBB
AAbb
aabb
aaBb
AaBB
Part B: What are the possible genotype(s) for true-breeding blue petunias?
aaBB
AABB
AaBB
aaBb
AAbb
Aabb
aabb
AABb
AaBb

Answer 1

Part A : aaBB

Part B : AAbb

Step-by-step explanation:

The flower petunia is a beautiful flower. The color of the flower is formed by the action of the two separate genes in the two separate pathways. The gene A produces blue pigments. The gene B produces the red pigment. And when both the genes are present the color looks purple. And when both the genes are recessive, it results in no color.

Thus the pure breeding of the red petunia may have the genotype -- aaBB.

Also the possible genotypes for the true breeding blue petunias is -- AAbb.