What is the cross between the `F_(1)` Progeny and the Homozygous recessive parent called ? How is it useful ?

What is coal tar? How is it useful to us?

What is seed drill ? How is it useful ?

What is coke?How is it useful to us?

What is PHBV ? How is it useful to man ?

What is n l^(x) method ? How is it useful ?

Two genes A and B are linked in a dihybrid cross involving these two genes, the F_(1) heterozygote is crossed with homozygous recessive parental type (aa bb). What would be the ratio of offspring in the next generation?

What is a herbarium? How is it useful to us?

What are indicators ? How are they useful ?

What are the differences between homozygous and heterozygous?

What is meant by parthenocarpic fruit? How is it useful?