lecture 14 - Sexual Dimorphism Anisogamy Evolution Function...

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Unformatted text preview: Sexual Dimorphism Anisogamy Evolution Function Maintenance Other Sexual Dimorphisms Evolution Function Maintenance Anisogamy Anisogamy: Reproduction by the union of two gametes that differ in form or size (usually size) By convention: Small motile gametes are Male Large immobile gametes are Female But forget male and female for a while Most multicellular organisms have: Two sexes Pronounced anisogamy Differences? Size Number Motility Selection Pressures on Gamete Size Productivity-- the number of gametes produced per unit time by a given parent Zygote fitness-- a measure of the probability that a zygote will survive to adulthood and reproduce, in the shortest time All things being equal, the maximum reproductive productivity occurs with the maximum number of gametes possible without reducing nuclear material. V/n would maximize productivity when it results in the nuclear size plus the minimal amount of cytoplasm possible. n then represents the productivity Gamete size Benefits to being tiny?...
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lecture 14 - Sexual Dimorphism Anisogamy Evolution Function...

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