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?

Question

Biology

Gina Martinez

10 February, 16:32

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?

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Zion Bell · 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%

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.