The genic balance theory of sex determination was proposed by:

Total number of autosomes in a fertilized egg (zygote) of a human is:

The chromosomal theory of sex determination was propounded by:

$A$ fruit fly is heterozygous for sex-linked genes and is mated with a normal female fruit fly. In what proportion will the male-specific chromosomes enter the egg cells (in $:1$)?

Which of the following correctly describes the mechanism of sex determination in the given example?

In $Bonellia$,all larvae are genetically and cellularly identical. The male individual lives in the uterus of the female. If a larva settles near the proboscis of an adult female,it develops into a male. If the larva develops freely in the water,it develops into a.....