BIOL 202 Lecture Notes - Lecture 5: Punnett Square, Quantitative Trait Locus, Centromere
7 Feb 2013
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Multiple gene inheritence part 2: chromosomal basis of independant assortment, recombination (a facet of multiple gene inheritance, organelle genes (cytoplasmic inheritance) It"s quite inefficient, when you think about it. Sexual female needs male to reproduce (meiosis) =99. 9% of organisms do this. Clonal female, [meiosis has shut down]these should replace sexual populations, unless theres something about meiosis thats important for life, and there is. Dandelions and the rotifer don"t need meiosis, theyre the . 1%, but the vast majority do need meiosis. In clonal population, ab can be produced by mutation, but won"t occur simultaneously. Eventually, the population may evolve towards the favored genotype, but it will take aw hile. Sexual populations will get there a lot faster due to independant assortment\ Ex: 5 hybrid cross, can use product rule (from probability theory) in the example in the last lecture: 1/4 * 1/2*1/4*1/2*1/4=1/256. Chromosomal basis of independant assortment (estrella eleanor carothers, 1883-1957) need to follow chromosomes around.
