Question

A pea plant with pink colour flowers [PP] is cross bred with a pea plant with white
flowers [pp]. Make a cross and answer the following:
a. What is the genotype of F1progeny?
b. What will be the percentage of plants bearing white flowers in F 2 generation,
when the F 1 plants were self-pollinated?

Answer 1

Answer:

The cross can be represented as shown in the figure.

a) The color of flowers in F

1

progeny is blue.

b) The phenotypic ratio of blue and white flowers in F

2

generation is 3 : 1

So, percentage of plants bearing white flowers in F

2

generation = 1/4 x 100 = 25%

c) The ratio of genotype BB and Bw in F2 progeny: 1: 2

Answer 2

Answer:

Since allele for the purple flower is dominant over the allele for white flowers, a cross between pure breeding purple (PP) and white flowered (pp) varieties will give all purple flowered (Pp) progeny. The presence of allele for the white flower is masked by allele for purple color and no white flowered progeny is produced in F1 generation.