University:
Eastern Kentucky University
Course:
BIO 331 | Cell Biology
Academic year:

2022
Views:

325

Pages:

2
Author:

Maverick Martin

Genetics Review Worksheet – Mitosis and Meiosis Name: 1. Compare and contrast the diff erent stages of cell division for mitosis and the two stages of meiosis. Fill in the major cellular event that is diff erent between the cellular division processes. Explain as needed. Mitosis Meiosis I No DNA replication prior to Meiosis II Interphase Homologous chromosomes pair up, form tetrads Prophase Telophase & Cytokinesis Starts with a haploid cell Homologous pairs (tetrads) align on metaphase plate Metaphase Anaphase Meiosis II (sister chromatids separate) Homologous pairs of chromosomes separate (sister chromatids remain attached) (sister chromatids separate) Results in two diploid daughter cells Results in two haploid daughter cells Results in four haploid gametes 2. Describe the diff erent mechanisms by which meiosis results in geneti cally varied gametes. (Chapter 10.4) Mechanism Definition How does this result in genetic variation? Random alignment of homologous pairs during Metaphase I Gametes from an individual may contain any combination of maternal and paternal alleles (genetic recombination) Random fertilization Random which gametes fertilize (any egg combines with any sperm…) Increases the possible combinations of genetic material in offspring Crossing over of segments of chromatids Non-sister chromosomes exchange segments of DNA during Prophase I of Meiosis (occurs when homologous pairs form tetrads) Increases random possible combinations of genetic material in gametes (increase in genetic recombination) Independent orientation of chromosomes