BIOL 1500 Lecture Notes - Lecture 8: Dna Replication, Nucleosome, Cell Division
Document Summary
Cells are rapidly dying and being replace. Cell division produces a continuous supply of replacement cells. Cell division also has a role in reproduction, growth, and development. Sexual life cycles include mitosis, meiosis, and fertilization. A fertilized egg, or zygote, divides by mitosis. The fetus grows and develops into mature adult consisting of countless cells with identical dna. The cells grow and divide by mitosis (division of all other cells other than sex cells) Each mature individual produces sex cells (gametes) by another form of cell division called meiosis (division of sex cells only) Sex cells combine at fertilization of male and female cells of gametes. Mitotic cell divisions allow and organism to grow and develop, repair tissues, and regenerate lost body parts. Apoptosis or programmed cell death carves out distinctive structures. In mitosis, the original cell is called the mother cell. Following cell division, the daughter cells have identical dna as the mother cell.