Why do many domesticated animals and plants have low fitness when compared to their wild relatives?
A. Small population sizes allow deleterious alleles to become fixed easily.
B. Deleterious alleles may be linked to genes favored during artificial selection and hitchhike to high frequency.
C. Inbreeding in domesticated varieties leads to low heterozygosity.
D. Both a and b
E. All of the above
Answer: E. All of the above
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