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Human Biology, 7/e
Dr. Sylvia S. Mader
Chromosomal Inheritance

Chapter Outline


19.1 Human Life Cycle

  • The human life cycle involves two types of cell divisions: mitosis and meiosis. 386

    19.2 Mitosis

  • Mitosis, nuclear division in which the chromosomal number remains constant, is involved in growth and repair. 387
  • Cytokinesis divides the cytoplasm and organelles between the daughter cells. 389

    19.3 Meiosis

  • Meiosis, nuclear division in which the chromosomal number is reduced by one-half, is involved in gamete production. 390

    19.4 Chromosomal Inheritance

  • Normally, humans inherit 22 pairs of autosomes and one pair of sex chromosomes for a total of 46 chromosomes. 395
  • Normally, males have the sex chromosomes XY and females have the sex chromosomes XX. 395
  • Abnormalities arise when humans inherit abnormal chromosomes or an abnormal number of chromosomes. 396-98








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