Chapter 22: Mechanisms of Evolution (Lecture 2) 03/02/'11

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10 Mar 2011
School
Course
BIOA02 Dr. P. Kamini
Lecture #18 (video)
Chapter 22: Mechanisms of Evolution
How is Genetic Variation Maintained within Populations
Color due to carotenoids cannot be produced, they are extracted from the
environment through eating or through the skin.
oCarotenoids are used for the immune system
oHigh levels of carotenoids display a healthy individual
Maintenance of Genetic Variation
1.Neutral Mutation:
Successful individuals are the ones that pass on their genes the
best
Alleles that do not affect fitness is a neutral allele
2.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
Disadvantages:
Recombination can break up adaptive combinations of
genes
Dividing offspring into genders reduces overall reproductive
rate
Advantages:
Possible for mutation not the be passed onto offspring due
to recombination
www.notesolution.com
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Document Summary

 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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