[ELI5] So if one circumstance of genetic equlibrium required for Hardy–Weinberg law to work is random mating, how are the frequencies of alleles and genotypes determined by this law constant when random mating is sexual reproduction…

Question

…so it leads to recombination and therefore change of allele frequencies?

With that being said, shouldn’t the circumstance be “no mating at all” to make the law determine frequencies at one specified moment?

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Answer 1

Why do you think sexual reproduction should lead to a change in allele frequencies? Each allele is equally likely to be passed down from each parent, and each individual is equally likely— according the HW conditions, at least— to be a parent. What’s the mechanism, do you suppose, by which some alleles would be preferentially inherited? (Spoiler: the whole point of Hardy-Weinberg equilibrium is that there isn’t one.)