CBSE Class 12-science Answered
(i) Why are grasshopper and Drosophila said
to show male heterogamety? Explain.
(ii) Explain female heterogamety with the help of an example.
Asked by Topperlearning User | 16 Jun, 2014, 03:46: PM
Expert Answer
(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.
Answered by | 16 Jun, 2014, 05:46: PM
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