October 20th, 2022

Big Bang to Humankind


Meiosis: formation of haploid gametic cells.

  • Cells have half the DNA, so when combined with another cell in fertilization there’s the normal number of chromosomes.
  • Similar to mitosis, twice, with any DNA replication the first time.
    • Crossing over of chromosomes mixes them to create genetic diversity.

Stem Cell

Can turn into any other cell.


  • Mutations during cell division are seen in the organism itself.
  • Mutations during meiosis are express in its children.

Heterozygote advantage

Aa has an advantage over AA and aa (example: immunity against malaria / sickle cell).