According to evolutionary biologist J.B.S. Haldane, which sex of a hybrid is generally more severely affected by genetic limitations like sterility?

Answer

The heterogametic sex (male in mammals)

Evolutionary biologist J.B.S. Haldane observed a pattern in many hybrids concerning fertility limitations tied to sex chromosomes. This observation points specifically to the heterogametic sex, which in mammals is the male sex, characterized by possessing differing sex chromosomes (X and Y). Haldane noted that this sex tends to be more severely impacted by the genetic imbalance resulting from interspecies breeding. For Zonkeys, this manifests practically as male Zonkeys being almost always completely sterile, even if they are physically viable. While female Zonkeys might theoretically retain some marginal chance of fertility, the male offspring are overwhelmingly rendered reproductively incapable due to this specific genetic vulnerability related to their sex chromosomes.

According to evolutionary biologist J.B.S. Haldane, which sex of a hybrid is generally more severely affected by genetic limitations like sterility?

#Videos

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