BIOL3044 Lecture Notes - Lecture 27: Outbreeding Depression, Inbreeding Depression, Zygosity
Document Summary
Recall: hybridization drosophila and loss of adaptive potential. The base population showed a significant response to artificial selection for the number of abdominal bristles. After a certain number of generations of genetic drift, those populations lost a lot of genetic variation and showed significantly less response to artificial selection than base population for the number of abdominal bristles. A lot more is going on than whether or not hybrids could store adaptive potential. There are pros and cons to maintaining a viable population that is responding to its environment. Pros: migration and mixing of populations increases genetic variation and adaptive potential, especially true in small populations. If a particular set of alleles present in one genotype fit together that"s different from another genotype, it"s a function of epistasis: recombination could potentially break up this set of alleles and result in a lower fitness. Built on the idea that there are advantages and disadvantageous to hybridization.
