Question

(i) why are grasshopper and drosophila said to show male heterogamety? Explain (ii) explain female heterogamety with the help of an example.

Answer 1

(i) Drosophila exhibits XY type of sex determination. Males produce two types of sperms, one having X chromosome and the other having Y chromosome, whereas females have

only X chromosome. Grasshoppers exhibit XO type of sex determination. Males produce two types of gametes, one with X chromosome and the other with no chromosome. Thus, both show male heterogamety.

(ii) Female heterogamety can be seen in female birds. In these, the females have one Z and one

W chromosome, whereas males have a pair of Z chromosomes besides the autosomes.

Answer 2

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Heterogamety means different sex gametes. Male heterogamety includes human males having XY sex chromosomes and males of some insects, such as grasshopper and bugs, having XO sex chromosomes. Female heterogamety includes females of some species of birds, fishes and insects.