100_Chap_19_Cell_Division

100_Chap_19_Cell_Division - Cell Reproduction Cell...

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Unformatted text preview: Cell Reproduction Cell Reproduction Chromosomes and Cell Division • The human life cycle has two types of cell division – Mitosis eiosis – Meiosis • Chromosomes consist of DNA and protein • Our cells divide in a characteristic cyclic pattern Two Types of Cell Division Meiosis produces gametes (eggs or sperm) for reproduction. Mitosis produces cells for growth and repair. MITOSIS MEIOSIS Figure 19.1 The male gamete, the sperm, is produced in the testes. The female gamete, the egg, is produced in the ovary. 2 n 2 n n Zygote 2 n MEIOSIS 2 n = 2 sets of chromosomes (diploid) n = 1 set of chromosomes (haploid) n 2 n MITOSIS Two Types of Cell Division • Mitosis – Results in identical body cells – Occurs during growth and repair eiosis • Meiosis – Gives rise to gametes that have half the number of chromosomes as the original cell – Meiosis forms haploid gametes Two Types of Cell Division Table 19.1 Nucleotide Structure (DNA) DNA Structure Chromosome Structure Chromosomes Consist of DNA and Protein • A chromosome is – A combination of a DNA molecule and specialized proteins called histones eukaryotic cells, chromosomes are found in • In eukaryotic cells, chromosomes are found in the cell nucleus • They contain the information that directs cell processes Chromosomes • A gene – A specific segment of DNA that directs the synthesis of a protein e point on a chromosome where a • The point on a chromosome where a particular gene is found is called its locus – Similar to an address Chromosomes • Somatic Cells – All cells except for egg and sperm...
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This note was uploaded on 10/06/2011 for the course BIO 100 taught by Professor Staff during the Spring '11 term at S.F. State.

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100_Chap_19_Cell_Division - Cell Reproduction Cell...

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