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Regarding gibbons, yes. According to National Geographic: Gibbons are monogamous and live in family groups consisting of an adult pair and their young offspring. There isn't a generalized answer for "family"-living, although specific family types are indicative of relationship type. Nuclear families (parents and children) tend to be monogamous, ...


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This is directly following the advice of Lande & Arnold (1983), saying: Linear multiple regression can be used first to estimate the forces of directional selection, $\beta$, and their standard errors. Then a quadratic multiple regression (16) or (Al), can be used to estimate the forces of stabilizing selection, $\gamma$, with their standard ...


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This post is very related to your question and is definitely worth reading. I hope your teacher didn't really say that! It is really not as easy as he's suggesting. There are a number of studies that address the question on whether Sexual Selection (SS) and Natural Selection (NS) have opposite or antagonist effects. The subject is not easy and as SS is not ...



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