BIOL10210 Lecture Notes - Lecture 8: Anisogamy, Cytoplasm, Isogamy
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2. 5-25 millionx greater risk of recessive inheritance of dangerous alleles from incest. Outbreeding you might introduce so many new genes to offspring that it"s a pro(cid:271)le(cid:373) generally strengthens offspring, but too foreign hurts them. Parthenogenesis: seen in aphids do sexually reproduce at some points of the year, but others asexually reproduce. born pregnant. Indirect sperm transfer (sexual: sperm packages placed, on landscape, her, in her anywhere she could pick it up, mostly insects, other invertabrates. Isogamy cells that are the same size: do(cid:374)"t see differe(cid:374)(cid:272)e i(cid:374) se(cid:454)/ge(cid:374)der (cid:449)e refer to them as mating types, fungus have isogamous cells. No limit on the mating types you have. Efficient to be able to mate with anyone or mostly everyone, but most things have two mating types, which is the least efficient, so why: two different sized gametes=two sexes. Species with 2 sexes have arisen from isogamous species over and over again. The sexes display striking differences at many levels:
