Question

Which of the following is the correct number of offsprings produced by self-fertilization of a heterozygous pea plant for a trait that exhibits Mendelian genetic pattern?

(a) 250 Homozygous dominant, 500 Heterozygous dominant and 250 Homozygous recessive

(b) 125 Homozygous dominant, 125 Heterozygous dominant and 125 Homozygous recessive

(c) 500 Homozygous dominant, 501 Heterozygous dominant and 250 Homozygous recessive

(d) 500 Homozygous dominant, 250 Heterozygous dominant and 500 Homozygous recessive

I had been asked this question in an internship interview.

I'd like to ask this question from Inheritance Principles topic in portion Principles of Inheritance and Variation of Biology – Class 12

Answer 1

Right answer is (a) 250 Homozygous dominant, 500 Heterozygous dominant and 250 Homozygous recessive

Easy explanation: Self-fertilization of heterozygote will lead to 25% homozygous dominants, 25% homozygous recessive, and 50% heterozygous dominants. This is satisfied if the population sampled has 250 homozygous dominant and recessive plant and 500 heterozygous dominant plants.