Question

Two Mark Questions :
Differentiate between ZZ and XY type of sex determination mechanism.

Answer 1

XY type of sex determination	ZZ type of sex determination
seen in human beings	seen in bird (like Hens)
male heterogamety is seen	female heterogamety is seen
the female produces 2 X chromosomes while the male produces X & Y chromosome	the male produces 2 Z chromosomes while the female produces Z & W chromosome