HISC45H3 Lecture Notes - Lecture 1: Dna Replication, Centromere, Synapsis
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Class 12 (class 11 was our first test) october 20, 2017 copyright hasenkampf 2017. I want to wrap up genetic mapping as it relates to crossing over. We have already looked at how to do mapping in the following situations: (1) x-linked genes in drosophila where only the f2 males are scored. [this testcross allows you to know what the di/tri-hybrid parent gave] (2) x-linked or autosomal genes for a di- or tri-hybrid that is testcrossed; all f2 can be scored (in. Now let"s look at a way to get some data out of self-crosses of di-hybrids where both sexes have similar rates of reciprocal genetic exchange. Calculating recombination frequencies from selfed dihybrids when males and females have approximately the same rates of crossing over. Let"s use bateson and punnett"s flower data to see this in action. Pp ll purple flower, long pollen pp ll. F1 pp ll (all purple flowers, long pollen) self-crossed the f1.
