CHEM 140B Lecture Notes - Lecture 4: Dihybrid Cross, F1 Hybrid, Gene Nomenclature

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Bicd 100: problem set online, do it online. Not on paper: deadline moved, quiz will be up soon, multiple correct answers, monohybrid, dihybrid, trihybrid, mono: single gene is different between the two inbreds. Aabbccddee crossed with aabbccddee: result: aa (f1 hybrid). Same string of letters but not necessarily the same alleles: heterologous = different chromosomes, different genes. Like chromosome 1 and 2 for example: let"s not memorize mechanics and stages of cell cycle, but focus on alleles separating, what"s happening to them, focus on metaphase especially. Let"s also pay attention to telophase, prophase, anaphase. Interphase: you can"t see the chromosomes: g0 = nondividing cells, know g1, heading for cell division, s phase: dna replication, synthesis, g2: resting phase, interesting stuff you don"t need to know. Condensation of choromosome: the x (chromosome after replication/tetrad) is not in g0, it"s after replication and just before mitosis.