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 recessive traits?

A fruit fly is heterozygous for sex-linked genes when meted with normal female fruit fly, the males specific chromosome will enter egg cell in the proportion

The best method to improve the genetic quality of mankind is

In $F_{2}$-generation, quantitative inheritance $1: 4: 6: 4: 1$ is obtained instead of

Point mutation may occur due to