BIOL 1090 Lecture 1: 5.%20The%20predictive%20value%20of%20Mendel%27s%20rules%203spp
9 Mar 2016
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Chapter 5 the chromosomal basis of mendel(cid:96)s principles , pp. Do (cid:108)questions & problems(cid:122) 3. 1, 3. 5, 3. 7, 3. 9! (all assigned problems have the same numbers in 5th & 6th editions of snustad & simmons)! The chromosomal basis for mendel(cid:96)s principle of segregation! Predicting the outcomes of a monohybrid cross with a. For 1 gene with 2 alleles there are:! 1x2 = 21 = 2 possible haploid genotypes (gametes)! Combining 2 different gametes from each of two parents:! The chromosomal basis for mendel(cid:96)s principle of independent assortment! Crossing over does not in uence the frequency of gametes for independently assorting genes! No crossing over that affects the b locus. Predicting the outcomes of a dihybrid cross with a. 2x2 = 22 = 4 possible haploid genotypes (gametes)! Combining 4 different gametes from each of two parents:! 4 x 4 = 16 possible diploid genotypes! For n different genes assorting independently, there are:! (2x2x2 )n = 2n possible haploid genotypes (gametes)!
