A dilute solution of phenylthiocarbamide tastes bitter to some people and is tasteless to others. This is an example of?

Thyroxine and adrenalin are examples of hormones which control?

A pair of genes that control a trait is referred to as?

The chromosome number of a cell before and after the process of meiosis is conventionally represented as?

At what stage in the life history of a mammal is the sex of an individual set?