Biology 1002B Lecture 17: Bio 1001A Lecture 17
12 Mar 2016
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Document Summary
Parent - offspring conflict is more intense in promiscuous mating systems than monogamous species. 1% of genes in mammals have only one allele expressed (either maternal or paternal) Most of these genes regulate embryonic growth (the rest are expressed in the brain) Loci with only maternal expression : downregulate growth. Loci with only paternal expression : regulate growth. Conflict hypothesis: which parents allele is silenced (imprinted) and which is expressed, reflects conflicting interests of maternally vs paternally derived alleles. Most mammals are promiscuous : females future offspring will probably have a different father. Extract as much resources as possible from the female. Conflict between fathers and mothers interests play out during offspring development. Nuclear genes inherited biparentally mtdna inherited maternally cpdna sometimes inherited maternally, sometimes paternally. Overcoming the prisoner"s dilemma: coordinating, repeating it over and over again (repeated interactions increases cooperation) Many altrusitic traits explained by shared genetic interests; other by reciprocity.
