Meiosis. Meiosis A type of cell division that produces four cells each with half the number of...
Transcript of Meiosis. Meiosis A type of cell division that produces four cells each with half the number of...
MeiosisMeiosis
MeiosisMeiosisA type of cell division that
produces four cells each with half the number of chromosomes as the parents
Homologous Chromosomes: Two pairs of chromosomes that carry the same genetic material
Haploid and DiploidHaploid and Diploid
Haploid◦A cell with a single set of chromosomes
◦Shown as n◦A human has 23 chromosomes
Diploid◦A cell with two sets of chromosomes
◦Shown as 2n◦A human has 46 chromosomes
as 2n
MeiosisMeiosis
Produces 4 genetically different haploid cells
Has two division stages◦Meiosis I◦Meiosis II
MeiosisMeiosis
Meiosis IMeiosis IProphase I
◦Creation of homologous chromosomes
◦Tetrads are formed◦Homologous chromosomes crossover
Meiosis IMeiosis IMetaphase I
◦Tetrads line upAnaphase I
◦Homologous chromosomes separate
Telophase I and Cytokinesis◦Cells separate with
homologous chromosomes
Meiosis IMeiosis I
Meiosis IIMeiosis IIProphase IIMetaphase II
◦Sister Chromatids Line upAnaphase II
◦Sister Chromatids separate Telophase II and Cytokinesis
◦Cells split and create haploid genetically different daughter cells
MeiosisMeiosisCreates four genetically different daughter cells
Crossing over creates genetic variation
Only sex cells go through meiosis
Gamete: A sex cell created by meiosis- Sperm or Egg
Mitosis VS. Mitosis VS. MeiosisMeiosisMitosis
◦Creates 2 identical daughter cells
◦Does not exchange or change genetics
◦One stage◦Diploid
Meiosis◦Creates 4 genetically different daughter cells
◦Exchanges or changes genetics through crossing over
◦Two stages◦Haploid