5. Ch5_Oct_26_prelecture_post

5. Ch5_Oct_26_prelecture_post - Oct 26th...

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10/25/09 1 56 We know that double recombinants are the smallest class of progeny Short Cuts with Double Recombinants Look parental with [email protected] of pr recombined progeny that show double X.O. Gene with recombined alleles [email protected] to parental [email protected] of other 2 genes must be in the middle. F1 female was vg pr b / vg+ pr+ b+ these combos are thus parental Smallest group was: 13 vg b pr+ 9 vg+ b+ pr Oct. 26th 57 Linked genes Linked genes from now on refers to genes that are < 50 m.u. apart We can [email protected] the distance b/w 2 genes that are farther apart by summing up the length of the map intervals b/w them
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10/25/09 2 58 Why a deficit of crossovers? Expected probability of X.O. between vg & pr ? = Expected probability of X.O. between pr & b ? = Expected probability of double X.O. b/w vg & b ? = Observed [email protected] of double X.O. b/w vg & b ? = 59 Why a deficit of crossovers? Random chance can do [email protected]@cal analysis Presence of 1 X.O. in a region chance of adjacent X.O.
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