'Exceptional sons' from Drosophila melanogaster mothers carrying a balancer X chromosome.

Abstract excerpt

This study reports on exceptional males which are obtained by using Drosophila melanogaster mothers carrying the balancers In(1)FM6 or In(1)FM7 as one of their X chromosomes. The phenomenon was first observed in interspecific crosses between D. melanogaster females and males of its closest relatives which normally produce unisexual female hybrid progeny. Whereas hybrid sons from these crosses die as third instar...

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