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Sexual Reproduction. Meiosis – the formation of sex cells. Vocabulary. Somatic Cell Gamete Homologous Chromosomes Diploid Cells ( 2n ) Haploid Cells ( n ). Normal body cell Sex cell – sperm or egg Matching pairs of chromosomes Cells that have homologous chromosomes (somatic cells)

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sexual reproduction

Sexual Reproduction

Meiosis – the formation of sex cells

vocabulary
Vocabulary
  • Somatic Cell
  • Gamete
  • Homologous Chromosomes
  • Diploid Cells ( 2n )
  • Haploid Cells ( n )
  • Normal body cell
  • Sex cell – sperm or egg
  • Matching pairs of chromosomes
  • Cells that have homologous chromosomes (somatic cells)
  • Cells that have only one chromosome from each pair (gametes)
mitosis vs meiosis
Mitosis vs. Meiosis

Mitosis

Meiosis

Sexual Reproduction

Results in four genetically different daughter cells

Creates haploid ( n ) cells

Involves two cell divisions

  • Asexual Reproduction
  • Results in two genetically identical daughter cells
  • Creates diploid ( 2n ) cells
  • Involves one cell division
prophase i
Prophase I
  • Homologous chromosomes form a tetrad
  • Segments of chromatids are exchanged
metaphase i
Metaphase I
  • Tetrads line up at the center of the cell
anaphase i
Anaphase I
  • Fibers pull tetrads apart
  • Haploid chromosomes move to opposite sides of cell
telophase
Telophase
  • Two haploid cells are formed
prophase ii
Prophase II
  • New fibers form and begin to connect to haploid chromosomes
metaphase ii
Metaphase II
  • Chromosomes line up along the middle of the cell
anaphase ii
Anaphase II
  • Chromatids of each chromosome separate and move towards opposite sides of the cells
telophase ii
Telophase II
  • Both cells divide to form four haploid cells containing half of the normal chromosome number.
  • Haploid cells turn into either sperm or egg cells depending on where they are formed.