BIO 200 Lecture Notes - Lecture 6: Metaphase, Dna Replication, Ploidy
Document Summary
Each of our cells have a set from our mothers and fathers. Sister chromatids separate into daughter cells= mitosis. Mitosis: during the interphase: the dna diffuse and replicates because the dna is accesable to the proteins, prophase: mitosis begins, chromosomes become sister chromatids, mitotic spindle- pulls them apart, metaphase: lines up at the cell. Highly coiled: anaphase: the poles, separated, telephase: fully separated, same number of daughter cells as there were parent cells, this is how organisms divide so they can grow. Meiosis: sexual division: leads to sperm and eggs, here, the homologous pairs join, crossing over, one chromosome ends up on each side of the cell, sister chromatids do not separate, we divide twice, 2n:4n:2n:1n. Haplod: a cell with one copy (1n) Diploid: a cell with two copies (2n) Sex chromosomes: y chromosome is very small, little genetic information, looks different!