In some organisms, male has ZZ chromosomes and female has ZW chromosomes. This type of sex-determination is found in: |
Drosophila Hen Cockroach Snail |
Hen |
The correct answer is Option (2) – Hen Sex determination is the method by which the sex of an individual is decided. The sex here means male denoted by XY and female by XX. Grasshopper is an example of XO type of sex determination in which the males have only one X-chromosome besides the autosomes, whereas females have a pair In Drosophila the males have one X and one Y chromosome, whereas females have a pair of X-chromosomes besides autosomes. To distinguish the sex determination mechanism in birds from the one described earlier, female birds have been designated with two different sex chromosomes known as Z and W chromosomes. In these organisms, females possess one Z chromosome and one W chromosome, while males have a pair of Z chromosomes in addition to the autosomes. |