With regard to heterosis, is each of the following statements consistent with the dominance hypothesis, the overdominance hypothesis, or both? A. Strains that have been highly inbred have become monomorphicfor one or more recessive alleles that are somewhat detrimentalto the organism. B. Hybrid vigor occurs because highly inbred strains are monomorphicfor many genes, whereas hybrids are more likely to beheterozygous for those same genes.C. If a gene exists in two alleles, hybrids are more vigorousbecause heterozygosity for the gene is more beneficial thanhomozygosity of either allele.
With regard to heterosis, is each of the following statements consistent with the dominance hypothesis, the overdominance hypothesis, or both?
A. Strains that have been highly inbred have become monomorphic
for one or more recessive alleles that are somewhat detrimental
to the organism. B. Hybrid vigor occurs because highly inbred strains are monomorphic
for many genes, whereas hybrids are more likely to be
heterozygous for those same genes.
C. If a gene exists in two alleles, hybrids are more vigorous
because heterozygosity for the gene is more beneficial than
homozygosity of either allele.
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