BIOL 1500 Lecture Notes - Moment Of Inertia, Zygosity, Retina
4 May 2014
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In a population, sperm and eggs each exhibit a 34% likelihood of carrying the b allele. The other allele in the population is the b allele. Draw a punnet square and add the 2 bb squares! ^ p^2 + 2pq + q^2 = (. 34*. 34) + (2*. 34*. 66) + (. 66*. 66) = . 1156 + . 45 + . 44 = 1. De: change in a population allele frequencies over time due to natural selection. Polygenic traits: more than one gene for a trait. Example of corn having: disruptive and polygenic due to many genes. ^ it would have been directional if there was a constant slope going one direction and not two. Countervailing selection as a fitness trade off. Directional selection: tends to reduce genetic diversity. If directional selection continues over time: favoured alleles eventually reach a frequency of 100% ^ they are said to be fixed. ^ the mean trait value doesn"t change. Purify selection: any type of selection where variation is reduced.
