Biology 1001A Lecture Notes - Lecture 15: Parental Investment, Sexual Dimorphism, Evolutionary Arms Race
25 Apr 2017
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How environmental stability influences whether sexual or asexual reproduction is favoured. If environment is stable and individuals are surviving, asexual reproduction may be favoured. However, in an unstable environment, sexual reproduction is favoured as a diversity of offspring genotypes are produced and this increases likelihood that at least some of your offspring will survive in the changing environment. Lottery principle and red queen principle as environmental (short-term) benefits of sex. Red (cid:395)uee(cid:374) a(cid:374)d evolutio(cid:374)a(cid:396)y cha(cid:374)ge: (cid:862)it takes all the (cid:396)u(cid:374)(cid:374)i(cid:374)g you ca(cid:374) do, to stay i(cid:374) the sa(cid:373)e place(cid:863). Diseases invent new keys, hosts change the locks. Lottery; place all your bets on the same set of numbers or diversify the numbers. How sexual reproduction places different selective forces on males vs. females. Males can best increase their fitness by mating w many females. With females on the other hand, they are constrained by the # of eggs they can produce as well as time constraints.
