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This sort of thing absolutely happens; useful search terms are "sex ratio distortion", "segregation distortion" (i.e. modifying the ratios with which different chromosomes segregate), and "meiotic drive" (a specific form of segregation distortion). Your scenario (Y-chromosome genes forcing all offspring to be male) is much less ...


1

first off you are talking about runaway sexual selection, run away sexual selection works because attracting mates matters MORE than individual survival. An immortal survivally perfect creature that cannot mate is an evolutionary dead end and might as well not exist where its genes are concerned. A bright red neon sign on your back that draws the attention ...


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I may have misunderstood your question, but there is no theory why usually reproductive costs are on the female, as this is a fact. Females have usually larger (and fewer) reproductive cells (gametes), they frequently have to carry the embryo until birth, and sometimes they have to attend to the offspring during the first stages of their lives. To put it ...


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