Biology 1001A Lecture Notes - Lecture 10: Homologous Chromosome, Genetic Recombination, Synaptonemal Complex

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Unequal crossing over gives rise to cnvs. We are still talking about ways to make copy number variations. Mating and sexual reproduction seems wasteful of resources, but it is needed to generate copy number variations. Making zygotes brings dna from different cells into the same cell in new combinations. A 2n zygote is formed from two n haploid gametes. Without sexual recombination, diversity in the species very dif cult to achieve. Homologous chromosomes have the same size and shape, they have the same genes in the same places, and one comes from each parent. Alleles are from different parents unlikely to be identical, therefore they are similar yet not the same. Parent organisms have to make gametes via meiosis. In meiosis i, the chromosome number is reduced from diploid to haploid, therefore is called the reductional phase. In meiosis ii, cells divide to give products with 1 x c amount of dna, therefore this is called the equational phase.

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