Question

7. in pea plants yellow seeds are dominant to Green .if a heterozygous yellow seed plant is crossed with a green seeded plant,what ratio of yellow and green seeded planta would you expect in F1 generation?

a) 9:1
b) 1:3
c) 3:1
d) 50:50 ​

Answer 1

Answer:

d

Explanation:

Since the yellow seeds are dominant to green, the allele for yellow seeds should be represented with upper case letter while the one for green seeds should be written in lower case letter. Let's suppose that the allele for yellow seed is Y and that for green seeds is y. Hence the genotype of the heterozygous yellow seeded plant will be "Yy" and that for green seeded plant will be "yy" (as the recessive allele is expressed only in homozygous conditions). The cross between heterozygous yellow seeded plant and green seeded plant will produce 50% yellow seeded plants and 50% green seeded plants. Hence, option A is the correct answer.