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Psyc 2500: Heredity

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PSYC 2500
Monique Senechal

th Class 2­ Sept 13  Developmental  Psychology: Genetic Basis of Child  Development • Mechanisms of Heredity 1. Biology of Heredity I. Each parent contributes 23 chromosomes. II. The first 22 are autosomes, and the 23 are the sex chromosomes III. DNA is the main component of the chromosomes. IV. Rosalind Franklin: Took X-rays of atoms in order to understand their structure. She already hinted in 1950 that DNA was a double helix. V. DNA is made up of a phosphate, sugar, and nitrogenous base. These bases are adenine, guanine, thymine, and cytosine. A combines with T, and C with G. VI. Human genome project VII. Genotype and phenotype: how one becomes the other (behavioral and physical manifestation). 2. Single Gene Inheritance I. Allele: The same gene on a pair of chromosomes. II. Remember Mendel’s pea experiment. III. HOMOZYGOUS alleles are the same, while HETEROZYGOUS alleles are different. IV. Heterozygous alleles will have a dominant and a recessive gene. 3. Genetic Disorders I. Sickle cell and cystic fibrosis are both recessive genetic disorders. II. Remember the working of the punnet square and the probability of a gene being expressed in different situations. III. The gene for Cystic Fibrosis is on chromosome 7. IV. Twin studies are ideal for studying this. V. Too many/few chromosomes can a
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