BIOA02H3 Lecture : Mechanisms of Evolution (Lecture 2) 03/02/'11

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10 Mar 2011
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color due to carotenoids cannot be produced, they are extracted from the environment through eating or through the skin: carotenoids are used for the immune system, high levels of carotenoids display a healthy individual. maintenance of genetic variation: neutral mutation: successful individuals are the ones that pass on their genes the best. alleles that do not affect fitness is a neutral allele: sexual recombination. combining different genes in many different sequences. Involves crossing over and different assortments of different genes \ ex: offspring is varied between two mates. produces the genetic variety that increases evolutionary potential. recombination can break up adaptive combinations of genes. dividing offspring into genders reduces overall reproductive rate. possible for mutation not the be passed onto offspring due to recombination www. notesolution. com. the variety of genetic combinations possible in sexually reproducing species may be especially valuable to defense against pathogens and parasites.

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