BLG 311 Study Guide - Nondisjunction, Growth Factor, Mendelian Inheritance
Document Summary
Mitosis occurs in all cells, meiosis occurs only in reproductive organs. Mitosis results in two diploid cells, meiosis results in four haploid cells. In mitosis homologous chromosomes do not pair. In meiosis homologous chromosomes do pair up. In mitosis crossing over does not occur. In meiosis crossing over occurs and increases genetic diversity: define the following, homologous pairs (b) sister chromatids (c) tetrad. Homologous pairs: chromosomes come in pairs called homologous pairs. They are chromosomes that are similar, but not identical. There are two chromosome number 1s, two chromosome number 2s, etc. The homologous pairs are the maternal (inherited from the mother) and paternal (inherited from the father) versions of the same chromosome. Ex: the homologous pair for eye colour are similar because they are for the same trait, but not identical. The alleles may be different, the allele passed on from the mother may be brown eye colour, and from the father blue eye colour.
