PSY 2105 Lecture Notes - Genetic Counseling, Haemophilia, Specific Developmental Disorder
13 Feb 2013
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September 17th 2012: study of the structure and function of genes. Genes - small unit of chromosomes that direct the synthesis or proteins chromosomes - long strands of dna. Heredity: sum of inherited traits and tendencies. The structure and composition of dna genes serve as recipes for the synthesis of proteins and enzymes. Cells are comprised of three divisions: nucleus contains the chromosomes. Chromosomes: strands of the genetic material dna. Each human cell contains 23 chromosome pairs (yielding 46 total chromosomes per cell) Autosomes comprise 22 of the 23 pairs. Sex chromosomes comprise the 23rd pair: males are xy, females are xx. Cells form two groups based on function: body cells: form the structures of the body. Reproduce by mitosis: forming two identical cells, each equipped with 23 pairs of chromosomes: germ cells: form the reproductive cells. Reproduce by meiosis: forming four cells with each cell containing only 23 chromosomes. These cells are the gametes: ova or sperm.
