Question

In a dihybrid cross, how many plants are impure only for one character in F2 generation out of 1000 plants​

Answer 1

Answer:

For example, RRYY/rryy parents result in F

1

offspring that are heterozygous for both R and Y (RrYy).

It will yield 4 dihybrid plants in F

2

generation. The ratio will be 9:3:3:1.

Answer 2

The answer to the question is 500.

As we know that the in a dihybrid cross, 500  plants are impure only for one character in F2 generation out of 1000 plants​.

For example:

Consider a cross between a pure tall and a pure dwarf plant,

TT x tt

The genotypic ratio in F2 is,

1:2:1 for the TT:Tt: tt.

Hence there are 50 percent impure breeds.

So 500 plants are impure only for one character in F2 generation out of 1000 plants​.