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Herrera, Sara et al. 2018 suggest that there are at least 33 S-alleles in apricot. I believe some species of Brassica have at least 60 S-alleles identified. However, there are dominance relationships among these alleles, so I don't think you can directly extrapolate from the number alleles to to the rate at which non-self pollen will be excluded. The ...


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I just want to report the finding of one paper here. I don't know much about the rest of the literature and can't comment on it. Otto et al. (2015) investigate this question in sexually reproducing organisms. As I understand it, they assume that the amount of time spent in on phase of the life cycle is proportional to the amount of selection happening in ...


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This is a hypothesis that I found in Desmond Morris book, The naked ape. Basically, humans transit from a rear-penetration position to a frontal-penetration position. In this transition, the sexual clue performs by buttocks was perform now by breast. In short, according to Morris: breasts are sexual clues because they look like buttocks.


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