6 - BIO 320: Lecture 6 Gene linkage & mapping: II. Life...

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Life cycle and meiosis in S. cerevisiae fusion to make a / α diploid BIO 320: Lecture 6 haploid α mating type cell haploid a mating type cell Meiosis haploid spore germinates and grows vegetatively Chromosome behavior in S. cerevisiae meiosis + Meiosis I a a α α Meiosis II Inspection of tetrads produced by meiosis in S. cerevisiae shows that recombination occurs after DNA replication. If recombination happened at the two strand stage (that is, prior to DNA replication) it would go like this: + - - - - - - - - Mating and meiotic recombination DNA rep. - - - - MI, MII meiotic products (called spores) are packaged into a sac called an ascus or tetrad Chapter 5: 5-28, 5-29, 5-31, QB: G3, G7, H17-28, H30 H31, H33, H38 Note: You are not responsible for knowing how to calculate gene- centromere distances using ordered tetrads. a a a a a a α α α α α α As predicted by Mendel’s first law, alleles segregate equally into gametes,. and therefore two spores contain
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This note was uploaded on 06/03/2008 for the course BIO 320 taught by Professor N/a during the Spring '08 term at SUNY Stony Brook.

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6 - BIO 320: Lecture 6 Gene linkage & mapping: II. Life...

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