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I think Wallace (1968) developed the ideas of hard and soft selection, as they relate to genetic load. He further explains the concept in Wallace (1975). As the idea was his, I'd go with Wallace's definition over Whitlock's. I haven't had time to watch the Whitlock video to see if they are saying more or less the same thing overall. Consider a hypothetical ...
In the linked paper, the authors discuss this as sex-based gene expression that evolved by sex-specific selection. The expression is not limited to one sex (which are sex-limited genes). Sex-biased genes are expressed by both sexes, but differently between sexes.
Is SS clearly different from Natural Selection (NS)? Is SS nested within NS or are NS and SS two different and (anti- or not) parallel processes? Darwin, in The Descent of Man, and Selection in Relation to Sex defined sexual selection as a type of selection that "depends on the advantage which certain individuals have over other individuals of the ...
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