Question

In pea plants, red flower color is dominant to white. Yellow seed color is dominant to green and inflated pods are dominant to constricted pods. Pollen is taken from a plant that is heterozygous for all three traits and used to fertilize flowers from a plant that is heterozygous for flower color, homozygous dominant for seed color and homozygous recessive pod shape. What are the predicted phenotypes and ratios for offspring from this mating?

Answer 1

The predicted phenotypes are:

Individuals with red flowers, yellow seeds and inflated pods. 37,5%

Individuals with red flowers, yellow seeds and constricted pods. 37,5%

Individuals with white flowers, yellow seeds and inflated pods. 12,5%

Individuals with white flowers, yellow seeds and constricted pods. 12,5%

Step-by-step explanation:

In these types of exercises you must build a Punnett square, and write the possible allele combinations for each gene, which parents can grant. In this case the male (pollen) can grant 8 possible combinations and the female 2 possible combinations.

The alleles you find in this Punnett square are:

A: Red flowers.

A: White flowers.

Y: Yellow seeds.

and: Green seeds.

I: Inflated pods.

i: Constricted pods.

In the phenotypes resulting from the offspring (boxed with colors) the dominant alleles will always be shown in the phenotype dominating the recessive ones.