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Meiosis- An Overview. Reduces number of chromosomes from a diploid (2n) number to a haploid (n) number Gametes, sex cells, have a haploid number of chromosomes until they fuse together to make a diploid zygote Diploid organisms (2n) have x number of homologous pairs of chromosomes .

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meiosis an overview
Meiosis- An Overview
  • Reduces number of chromosomes from a diploid (2n) number to a haploid (n) number
  • Gametes, sex cells, have a haploid number of chromosomes until they fuse together to make a diploid zygote
  • Diploid organisms (2n) have x number of homologous pairs of chromosomes
homologous chromosomes
Homologous Chromosomes

At what stage of the cell life cycle was this photo taken?

How would you describe these chromosomes?

genetic variation
Genetic Variation
  • The whole purpose of sex and meiosis
  • Occurs through crossing over and independent assortment of homologous chromosomes
  • Crossing Over
  • Occurs between non-sister chromatids during the bivalent or tetrad formation
  • Swap maternal and paternal alleles to create recombined chromatids
  • Independent Assortment
  • At metaphase I, tetrad homologues orient the maternal and paternal to opposite polls at random
  • This create 2x number of combinations…. X being number of paired chromosome in the organism
significance of genetic variation
Significance of Genetic Variation
  • Allows population to survive as the environment changes
meiosis
Meiosis

Meiosis Animation, Sumanas Inc

Meiosis Animation, YouTube

Meiose, YouTube

the life cycle
The Life Cycle

Animal

Plant

oogenesis

spermatogenesis