PSY 2105 Lecture Notes - Zygosity, Antonie Van Leeuwenhoek, Sandra Scarr
18 Sep 2013
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Genotype (genetic endowment inherited from ancestors) eye color. Phenotype (physical characteristic that are observable & measurable) Sandra scarr said development is the process whereby a genotype comes to be expressed as a phenotype. No 2 ppl have the same genotype. 17th century- anton van leeuwenhoek (invented the microscope) > concluded that sperm was alive & was involved in reproduction. > sperm contains a tiny, preformed homunculus (preformationism) > sperm and ovum unite to create a single cell. > inherited characteristics produced by genes (transmitted unchanged from generation to generation) > each characteristics determined by pair of genes (1 inherited from each parent) > members of gene pair may differ in their effects (1 may dominate the other) > when gametes produced (gene pair for each attribute divides) Current notions chromosomes: normal human cells contain 2 sets of 23 chromosomes (23-pairs) 1 member of each pair from mother, 1 from father.
