First slide

Inheritance of One Gene

Question

In a monohybrid cross, 120 plants are obtained. The ratio of homozygous and heterozygous will be

Easy

A

40 : 80
B

60 : 60
C

20 : 100
D

10 : 110

Solution

Let us consider that a pure tall plant was crossed with a dwarf plant. Then all the F₁ progenies will be tall and when these progenies are selfed then we will get genotype in the ratio of 1(TT):2(Tt):1(tt). Therefore, number of homozygous offspring will be $\frac{2}{4} \times 120 = 60$ and the number of heterozygous offspring will also be $\frac{2}{4} \times 120 = 60$ .

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