Meiosis Flashcards
Meiosis:
Only occurs in gametes, which are sperm and ova cells, results in four unique daughter cells that are half of the number of parent cellst that are haploid
Crossing over:
crossing over occurs in prophase one of meiosis,
Crossing over is the exchange of genetic material between homologous chromosomes during meiosis.
Steps of meiosis:
Prophase 1: nucleus breaks down, crossing over occurs,
Metaphase 1:
homologous pairs of chromosomes line up at middle of cell
Anaphase 1:
homologous chromosomes are pulled to opposite ends of the cell
Telophase and cytokinesis:
nuclear membrane reappears, haploid cells are created, cell membrane pinches in
Prophase 2:
no crossing over, no replication but other than that same as prophase 1
Metaphase 2:
single chromosomes, two sister chromatids line up in center of cell
Anaphase 2:
sister chromatids are pulled to opposite ends of cell
Telophase 2 and cytokinesis:
Nuclear membrane reforms, chromones disperse into chromatin
End result:
4 genetically unique daughter cells that are haploid.