Intro To Genetics.

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Presentation transcript:

Intro To Genetics

I. Two things influence who you are: A. Environment B. Heredity http://www.cartoonstock.com/lowres/hsc0286l.jpg

II. Gregor Mendel (1822 – 1884) A. Father of genetics B. Studied inheritance patterns C. Crosses between pure-breeding pea plants

Contrasting traits: 1. tall or short 2. yellow or green 3. roll tongue or not

Human Contrasting Traits

A. Trait: variation of a particular characteristic III. Basic Vocabulary A. Trait: variation of a particular characteristic B. Gene: unit of heredity information C. Dominant: gene that masks another gene in a pair (T) D. Recessive: gene that is hidden by the dominant gene (t) Must have 2 recessive to show E. Allele: either member of a pair of genes that determines a single trait

F. Homozygous (purebred): two genes in a pair are identical (TT or tt) G. Heterozygous (hybrid): a dominant and recessive gene in a pair (Tt) H. Genotype: genes present (bb) I. Phenotype: expressed trait (brown)

Practice: 1. Which genes are dominant? q R T b N 2. Which gene are recessive? a m T U 3. Which are heterozygous? AA Gg Rr PP Which will show the dominant trait? Aa BB ff Gg 5. Which will show the recessive trait? Aa bb ff WW