Male heterogamety is not seen in:

1. Humans

2. Melandrium album

3. Birds

4. Fruit fly

Which one of the following conditions correctly describes the manner of determining the sex in the given example?

(1) XO type of sex chromosomes determine male sex in grasshopper

(2) XO condition in humans as found in Turner syndromee, determines female sex

(3) Homozygous sex chromosomes (XX) produce male in  Drosophila

(4) Homozygous sex chromosomes (ZZ) determine female sex in birds

Which of the following is correct ?

(1) Henking discovered the small Y-chromosome.

(2) Drosophila also shows XX-XY sex determination like human.

(3) Birds have ZZ-ZW sex determination, where females are ZZ and males are ZW.

(4) Grasshoppers show XX-XY sex determination. 

In which of the following male heterogamety is not observed?

(1) Insects

(2) Birds

(3) Humans

(4) (1) and (2)

In which of the following female heterogamety is not observed?

(1) Insects

(2) Birds

(3) Humans

(4) (1) and (3)