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Inbreeding depression may be reduced by selection against deleterious alleles, which eliminates, or purges, them from the population. I have two questions:

  1. Is genetic purging based on random shuffling of the genes of an individual or is it more intentional way of removing deleterious recessive alleles?
  2. Do the individuals/couple with deleterious alleles that breed together, pass down the purged genes EACH AND EVERY TIME they produce offspring? Does it happen every time they mate or just some times?
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  • $\begingroup$ Your terminology is a bit off: especially 'genetic purging' can easily be understood in a very negative way, and I'm not sure you are using inbreeding in the correct way. Otherwise reading up on how genetic inheritance works should help you to answer your question (which is very broad and doesn't really have one general answer). $\endgroup$
    – Nicolai
    Aug 27, 2017 at 16:17
  • $\begingroup$ Check out the Chillingham cattle. They were sectioned off in the 1200s and no new outsiders have been introduced in 300 years. $\endgroup$
    – user47011
    Oct 27, 2018 at 10:37

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Is genetic purging based on random shuffling of the genes of an individual or is it more intentional way of removing deleterious recessive alleles?

There is no intention in evolution. Purging refer to the action of selection at removing deleterious alleles. This term is specifically used when a population goes through a demographic change under which purifying selection becomes more efficient (such as an increase in inbreeding coefficient).

Do the individuals/couple with deleterious alleles that breed together, pass down the purged genes EACH AND EVERY TIME they produce offspring? Does it happen every time they mate or just some times?

Purging is a population-level process so your second question does not make much sense

Rephrasing the above a bit differently, purging refers to the reduction in frequency of deleterious alleles in the populations. Individuals will transmit whatever allele they can transmit.

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