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Description:
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• There are three kinds of strains involved in this type of hybrid incompatibility, namely H strains, neutral strains and non-permissive [NP] strains. When an H male is crossed to a neutral female, F1 hybrids are viable. However, when an H male is crossed to an NP female at 25 C, the progeny all die as larvae. Incompatibility is less severe at 32 C. Crosses between neutral and NP strains are fully compatible.
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