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The male fruit fly and female fowl are h...

The male fruit fly and female fowl are heterogametic while the female fruit fly and the male fowl are homogametic. Why are they called so ?

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Male fruit fly has sex chrromosomes XY and female fowl has sex chromosomes ZW. These chromosomes are heteromorphic (i.e., XY and ZW), therefore, they are examples of heterogamety. On the other hand, female fruit fly (having sex chromosomes XY) and mal fowl (having sex chromosomes ZZ) have similar chromosomes. Therefore, they are the examples of homogamety
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