Cell Reproduction 8.1 (p. 146-147) Sex chromosomes = determine the sex of the organism and other related characteristics Named X and Y Females are XX males.

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Presentation transcript:

Cell Reproduction 8.1 (p. 146-147) Sex chromosomes = determine the sex of the organism and other related characteristics Named X and Y Females are XX males are XY

Cell Reproduction 8.1 (p. 146-147) Autosomes = all of the other chromosomes in an organism Auto = self soma = body Autosomes are homologous chromosomes Homologous = same size and shape, and same genes Humans: 23 pairs of chromosomes 22 autosomes 1 pair of sex chromosomes

Cell Reproduction 8.1 (p. 146-147) Haploid cells = cells that have half or only one set of chromosomes (1n) 1n is one set of n chromosomes When sperm and egg combine each contributes 1n chromosomes This creates a new cell with a 2n chromosomes (1n + 1n = 2n) This is the first cell off a NEW and unique organism If humans have 23 pairs of chromosomes n=23 What does 2n = ?

Cell Reproduction 8.1 (p. 146-147) Diploid cells = cells that have two sets (2n) of chromosomes Somatic cells = diploid cells; all cells that are not sex cells Karyotype = full set (2n) of an individual organism’s chromosomes (p.147)

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Cell Reproduction 8.1 (p. 146-147)

Cell Reproduction 8.1 (p. 146-147)