BIO1042 Lecture Notes - Lecture 9: Disruptive Selection, Zygosity, Allele Frequency
22 Aug 2018
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What is environmental biology about: what are the effects of, climate change, global warming, changing rainfall patterns, habitat destruction. What alternative are available: migration, plasticity (change in behaviour, development physiology, adaptation (genetic change) Individuals are made up of chromosomes which are made up of genes: genes are represented by sequences of a dna that codes for a particular protein or function. If these alleles are the same we say that the individual is "homozygous" for that gene. If the two alleles different, then the individual is. What is evolution: you can"t ha(cid:448)e e(cid:448)olution (cid:449)ithout a change in the unde(cid:396)lying dna se(cid:395)uences, evolution requires genetic variation. Some alleles might increase if frequency over generations. What causes evolution: any process that changes allele frequencies, random events, genetic drift, unpredictable changes in allele frequencies across generations, due to chance factors, non random, selection (survival of the fittest)
