Question

Why does the mating of two closely related animals after a few generations lead to loss of fertility and vigour in animal husbandry?

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Answer 1

Answer:

A.3. Since recessive alleles tend to get together and express causing harmful effects in the progeny.

Answer 2

Answer:

In animal husbandry, if two closely related animals are mated for a few generations, it results in loss of fertility and vigour. ... Continued inbreeding causes inbreeding depression because due to homozygosity there is accumulation of recessive genes in the animals.