Question

Heterozygous round and yellow seeded pea plants were selfed and total 800 seeds are collected . what is the total number of seeds with first dominant and second reccessive traits?

Answer 1

In Mendel's dihybrid cross, the ratio of different phenotypic traits obtained by selfing the pea plants of character heterozygous round yellow seeds is as follows:

The $F_2$ ratio for the dihybrid cross between a heterozygous round and yellow pea plants is 9:3:3:1 which is shown here:

Round-Yellow : Round-Green : Wrinkled-Yellow : Wrinkled-Green

9 : 3 : 3 : 1

The first dominant and second recessive traits mean round-yellow seeds.

Since out of 16 seeds 3 are round-yellow, therefore out of 800 seeds,

The ratio of round-yellow plants:

$\frac{3}{16}\times 800=150plants$