CELL DIVISION Text: Mastering Basic Concepts (3rd), Bk1, pp.92-98.

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CELL DIVISION Text: Mastering Basic Concepts (3rd), Bk1, pp.92-98

Types of cell division n 1. Mitotic cell division n 2. Meiotic cell division –(will be discussed in Ch.22: Genetics)

Mitotic cell division n Mitotic cell division consists of two parts: n 1. Mitosis –the division of the nucleus n 2. Cytoplasm division –the division of the cytoplasm

Mitosis n The nucleus divides into two identical daughter nuclei (sing. nucleus) n Therefore each daughter nucleus can carry the same function as it parent nucleus

Mitosis What can we find inside the nucleus? n Each nucleus carries many thread-like structures called chromosomes n Chromosomes carry the genetic materials called DNA (deoxyribonucleic acid)

Mitosis Structures of chromosome

Mitosis Stages of mitosis n 1. Cell growth –to make an copy of each chromosome n 2. The duplicated set is separated n 3. Each daughter nuclei receive one set of chromosomes

Cytoplasmic division starts

Cytoplasmic division n Cytoplasmic division follows mitosis n the cytoplasm is divided into two halves n mitotic cell division finishes after the completion of cytoplasmic division

Cytoplasmic division animal cell Two identical daughter cells

Cytoplasmic division plant cell

Mitosis Where mitosis occurs? n Mitosis takes place in most types of cells, excepts cells in the testes and ovaries. n In plants, mitosis occurs at the root tips and shoot tips

Mitosis Importance of mitotic cell division n 1. Growth n 2. Repairing the damage tissues n 3. Replacement of worn-out cells