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Welcome to Biology.SE The question suggests that you have important lack of knowledge in Biology (which is fine). It will be impossible to explain everything in a post. I therefore just provide a short answer and redirect you to some source of knowledge that will be necessary to read for you to really be able to understand the basis of molecular biology and ...


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Certainly it is not necessarily the case that having two of the same allele is a bad thing - if there is a "bad" allele then there is a "good" allele. It can be that the heterozygote is equal, better than, or worse than either homozygote. When the heterozygote is fitter than both homozygotes it is called heterosis and, when this is the case, outbreeding/...


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The phrasing in quite unclear and I would not be able to comment on it. In short: yes, hybridization can cause offspring to have either particularly low or particularly high fitness. Hybrid depression refers to cases where hybrids have low fitness while heterosis or hybrid vigour refers to cases where hybrids have a higher fitness than any of the two parent ...



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