BIOL 1090 Lecture Notes - Lecture 5: Pocket Cube, Punnett Square, Dihybrid Cross
8 Apr 2016
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The chromosomal basis for mendel"s principle of segregation. Predicing the outcomes of a monohybrid cross with a punnett square. For 1 gene with 2 alleles there are: 1x2 = 21 = 2 possible haploid genotypes (gametes) Combining 2 diferent gametes from each of two parents: 2x2=4 possible diploid genotypes. The chromosomal basis for mendel"s principle of indepdendent assortment. Crossing over does not inluence the frequency of gametes for independently assoring genes. Predicing the outcomes of a dihybrid cross with a punnett square. For 2 genes there are: 2x2= 22 = 4 possible haploid genotypes (gametes) Combining 4 diferent gametes from each of two parents: 4x4 = 16 possible diploid genotypes. For n diferent genes assoring independently, there are: (2x2x2 )n = 2n possible haploid genotypes (gametes) So for 23 diferent genes, all on a diferent human chromosome: 223 = 8,388,608 diferent haploid gamete genotypes. And for 100 independently assoring genes: 2100 = >1,000,000,000,000,000,000,000,000,000,000.
