Question 16 1 pts How does the dominance theory explain why the heterogametic se

Question

Question 16 1 pts How does the dominance theory explain why the heterogametic sex is at a disadvantage in Haldane's rule? If a dominant allele has a negative effect on the fitness of hybrids, it will always be expressed in the heterogametic hybrids that possess that allele because they only need one copy of the respective sex chromosome. If a recessive allele linked to a sex chromosome has a positive effect on the fitness of hybrids, that allele will never be expressed in the heterogametic hybrids that possess that allele because they only have one copy of the sex chromosome that carries the allele. If a recessive allele linked to a sex chromosome has a negative effect on the fitness of hybrids, that allele will always be expressed in the heterogametio hybrids that possess that allele because they only have one copy of the sex chromosome that carries the allele. Beneficial dominant alleles will never be fully expressed in hybrids as they only carry one copy of the sex chromosome that carries the allele.

Explanation / Answer

ANSWER 16
If a recessive allele linked to a sex chromosome has a negative effect on the fitness of hybrids, that allele will always be expressed in the heterogametic hybrids that possess that allele because they only have one copy of the sex chromosome that carries the allele.

ANSWER 19
allopatric speciation

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