The person who discovered $Y$ chromosomes was

In human beings, sex is determined

Which of the following genotypes represents an intersex individual in Drosophila?

Initial clues about the genetic/chromosomal mechanism of sex determination can be traced back to some of the experiments carried out in:

How many types of sex determination mechanisms exhibit dissimilar sex chromosomes?

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.....