Question

if a pure tall pea plant is crossed with a pure dwarf plant,then in the first generation only tall plants appear.

(a) what happens to the traits of dwarf plant?

(b) In the second generation, the dwarf trait reappears.why?

Answer 1

Answer.
Let the genotype of : Pure tall plant / Homozygous dominant gene be TT, Heterozygous gene be Tt, and Homozygous recessive gene be tt. Since, the character - plant height follows Mendelian genetics, so it also follows the 'Law of Dominance'. Thus, the T allele is dominant over t allele.

a) In the F1 generation, all the plants have the genotype Tt. So, here, since T is dominant over t, the expression of t is suppressed and only the expression of T is expressed. Thus, the genotype contains the allele t, irrespective of it being expressed in the progeny.

b) In the F2 generation, the genotype of the plants TT:Tt:tt are in the ratio of 1:2:1. So, the plants which are present in homozygous recessive condition i.e. tt, are only, able to express the 'short' trait, since there is no one to suppress it. So, in the F2 generation, this trait again reappears.

Answer 2

Answer:

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