BIOL 205- Midterm Exam Guide - Comprehensive Notes for the exam ( 68 pages long!)

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Gene pairs segregate equally in gamete formation. All components of a cell must divide when the cell divides. Bivalents of all (cid:272)h(cid:396)o(cid:373)oso(cid:373)es (cid:373)o(cid:448)e to the (cid:272)ell"s e(cid:395)uato(cid:396), a(cid:374)d (cid:449)he(cid:374) it di(cid:448)ides, o(cid:374)e dyad moves into each new cell, by way of spindle fibres. In the second division, centromeres divide and each member of a dyad moves into a daughter cell. Summary of meiosis: start: two homologs, replication: two dyads, pairing: tetrad, first division: one dyad to each daughter cell, second division: one chromatid to each daughter cell. Beha(cid:448)iou(cid:396) of (cid:272)h(cid:396)o(cid:373)oso(cid:373)es du(cid:396)i(cid:374)g (cid:373)eiosis (cid:272)lea(cid:396)ly des(cid:272)(cid:396)i(cid:271)es me(cid:374)del"s la(cid:449) of e(cid:395)ual. Fungi and algae are good examples of haploids: spend most of their time in a haploid state but can mate, in the process forming a transient diploid cell that becomes the meiocyte. If four spores from one sac (ascus) are isolated and used to generate four yeast cultures, equal segregation within one meiocyte is shown as two white cultures and two red.

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