Biology 1001A Lecture Notes - Lecture 14: Frequency Distribution, Frequency-Dependent Selection, Isogamy
7 Mar 2016
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Places fundamentally diff selection pressures on males than on females. Can create new combinations of alleles + diff genotypes (not just mutations that can cause genetic variation) Source of genetic diversity/variation (cannot make new alleles, only diff combinations) Offspring diff from parents and siblings (exception: identical twins, triplets, etc carry identical genotypes) Ex. armadillos all offspring are genetically identical to e. o, but diff from parents. Lizards in arizona parthenogenesis b/w 2 females, no sexual recombination. Gives rise to offspring that are genetically identical to parents. Reproducing sexually generates new combinations of alleles (ex. Offspring are distinct from either parent + usually from e. o. When conditions are good, individual reproduces asexually, genetically identical to parents (ex. If conditions get worse, reproduce sexually (ex. tree - pollen) Obligately sexual humans must have sex in order to reproduce, no other way. Obligately asexual cannot reproduce since there are only females (reproduce asexually)
