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(i) Why are grasshopper and Drosophila said to show male heterogamity ? Explain. (ii) Explain female heterogamity with the help of an example. |
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Answer» (i) Drosophilia exhibit XY type of sex determination. Males produce two types of sperms, one having X chromosome and one having Y chromosome. Whereas females have only X-type of chromosomes. Grasshoppers exhibit XO type of sex determination. Males produce two types of gametes, one with X chromosome and 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 beside the autosomes. |
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