BIO 198 Lecture Notes - Lecture 16: Chromosome, Centromere
15 Oct 2016
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9/24 from 3:30 to 5:30pm @ hubbell (bring colored pens, bring a calculator) If you have a+s-, this has no observable phenotype because a+ is wt even though s- is suppressor mutation. Will get ab, ab, ab, ab which are all parental or non- parental where you get ab, ab, You can see all four products of a single meiotic division. If on one of the them has a crossover, you will get a tetrad score: You will get a 1:1:4 (pd, npd, tt). Parental ditype will have two spores such as (aa, aa, aa and aa). If o(cid:374)e of the ge(cid:374)es (cid:449)ere li(cid:374)ked to the (cid:272)e(cid:374)tro(cid:373)ere (the tetra type (cid:449)o(cid:374)"t (cid:271)e a(cid:271)le to (cid:272)ross o(cid:448)er as easily and will become 1:1<4 as the genes become closer and closer to the centromere). If they are on the same chromosome: you (cid:449)o(cid:374)"t get a(cid:374)y differe(cid:374)t tetrads.
