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Sub-lethal and disharmonic chromosome combinations



Sub-lethal and disharmonic chromosome combinations



Hereditas 12(3): 271-293



The crossing of Me-topsilus porcellus L. [female] X Chaerocampa elpenor L. [male] (Lep-idoptera) gives both [male][male] and [female][female], whereas the reciprocal cross, elpenor [female] Xporcellus [male], gives only [male] imagoes, the [female[[female] dying as pupae. The death of the [female] pupae is caused by the sublethal effect of the combination of a porcellus X chromosome with an elpenor Y chromosome (XpYe); this is proved by backcrossing the hybrid [male][male] XpXe to the parent species. Similar sublethal combinations of sex chromosomes are found in other Sphingidae hybrids; in some cases the [female][female] are killed at the larvae stage, in other cases the [female] imagoes develop, but lay no eggs. The effect may consist also only in retardation of development, so that the 2 sexes hatch at different times. These effects of hybridization are supposedly due to a disturbance of gene balance, which in the pure species is harmonious.

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