BIS 101 Chapter Notes - Chapter 3: Branch Migration, Dna Replication, Meiosis

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Dna recombination involves exchange of genetic material either between multiple chromosomes or between different regions of same chromosome: homologous regions of chromosomes line up in prep for exchange and some degree of sequence identity is required. Diploid eukaryotic organisms exchange genetic information during meiosis: ensure each gamete includes info from both parents (maximize genetic diversity) Also used i(cid:374) dna repair (cid:894)d b"s(cid:895) + duri(cid:374)g dna repli(cid:272)atio(cid:374) (cid:894)assist i(cid:374) filling gaps and prevent stalling of replication fork: sister chromatid serves as donor of missing material recombination followed by dna synthesis. Use (cid:272)or(cid:374) that has o(cid:374)e (cid:272)hro(cid:373)oso(cid:373)e (cid:894)i(cid:374) pair(cid:895) exhi(cid:271)it k(cid:374)o(cid:271) (cid:271)ut other does(cid:374)"t: some alleles physically linked to knob, other alleles tied to normal chromosome. Recombination also occurs in prokaryotic cells: conjugation genetic material transferred from one bacterium to another + may be recombined in recipient cell, also has important role in dna repair/replication. Recombination occurs with high degree of accuracy @ high frequency in both eukaryote.

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