PSYC 2500 Lecture Notes - Lecture 2: Cytosine, Sickle-Cell Disease, Behavioural Genetics
14 Jul 2020
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Chapter 2: genetic bases of child development: 1. Mechanisms of heredity: 1. 1 the biology of heredity, gametes (sperm and egg cells, have 23 chromosomes, dna (deoxyribonucleic acid, at conception, the 23 chromosomes in the sperm merge with the 23 chromosomes in the egg. The 46 chromosomes that result include 22 pairs of autosomes plus two sex chromosomes. Each chromosome is one molecule of dna, which consists of nucleotides organized in a structure that resembles a spiral staircase. A section of dna that provides specific biochemical instructions is called a gene: 4 chemical bases : adenine, thymine, guanine and cytosine, the human genome project. Inherited disorders are rarely carried by dominant alleles because individuals with such a disorder usually don"t live long enough to have children: exception = huntington"s disease, web site with maps of diseases for each chromosome: (http://www. dnarss. com/chromosome_1. html, 2.
