Lesch Nyhan disease is an $X-$linked recessive disorder that causes neurological damage in human beings. $A$ survey of $500$ mates from a caucasion population revealed that $20$ were effected with this disorder. What is the frequency of the normal allele in this population?

Study of improvement of human race by providing ideal nature is

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?

The term "genotype'' was coined by

One of the parents of a cross has mutation in its mitochondria. In that cross, that parent is taken as a male. During segregation of $F_{2}$-progenies that mutation is found in