BIOL 100 Lecture Notes - Lecture 25: Cape-Class Cutter, Allosome, Wild Type
23 May 2016
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Document Summary
*genes are affected by many factors and therefore they have a level of penetrance and expressivitiy. Penetrance: (deals w/population) proportion of individuals in a group with a given genotype that express the corresponding phenotype: level of penetrance: how many individuals with that phenotype. Expressivity: (deals w/individual) the degree to which an individual expresses a phenotype of a given genotype: how much that gene plays a role in a particular characteristic. Homologous chromosomes can exchange portions during prophase 1 of meiosis (this is crossing over) If genes are close together, they tend to stay together. If they are farther apart on the same chromosome, they are more likely to separate during recombination or crossing over. Recombinant frequency: going to be greater for loci that are farther apart because the chiasma is more likely to cut between those genes. A recombinant frequency is the result of crossing over that appear in repeatable proportions.
