Biology 1001A Lecture Notes - Lecture 6: Gametophyte, Mitosis, Plasmid
Document Summary
Transduction and transformation involve dna exchange in dead cells recombination enzymes cut and paste both dna backbones. Inheritance of difference in prokaryotes transposons can send a copy of themselves onto a plasmid(recombination);plasmid then sends itself to another bacterial cell. Homologous chromosomes carry the same genes, but different alleles recombination happens in meiosis 1, homologues pair and recombine. Women go into meiosis at birth, but go into meiotic arrest. In meiosis 1, the chromosome number is reduced from diploid to haploid (2n n) In meiosis 2, the cells divides to give products with 1c amount of dna (46 chromatids; 23 chromosomes) chromosome line up on the metaphase plate independently of each other. Zygote divides by mitosis, (diploid phase) products of meiosis is gametes (n) that fertilize and become a zygote (2n) Meiosis does not only make gametes; plants produce spores that go through mitosis and forms a gametophyte forming gametes by mitosis.
