• females
  • In mammals, females are XX, they can pass along either of their X's, and since the males are XY they can pass along either an X or a Y. For a mammal to be chromosomally female, the individual must receive an X chromosome from both parents, whereas to be chromosomally male, the individual must receive a X chromosome from their mother and a Y chromosome from their father. (wikipedia.org)
  • cells
  • Early in female embryonic development, in cells other than egg cells, one of the X chromosomes is randomly and permanently partially deactivated: In some cells the X chromosome inherited from the mother is deactivated, while in others the X chromosome from the father is deactivated. (wikipedia.org)
  • Later on during the 1930s Harriet Creighton and Barbara McClintock were studying meiosis in corn cells and examining gene loci on corn chromosomes. (wikipedia.org)
  • Meiosis is a round of two cell divisions that results in four haploid daughter cells that each contain half the number of chromosomes as the parent cell. (wikipedia.org)