5. Definitions: trait: a characteristic that can be passed from parent to offspring heredity: the passing of traits from parents to offspring genetics: the study of heredity
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7. Traits in Pea Plants Pea plants have many different traits Some traits are dominant over others Allele: a form of a gene (different bases along the DNA) Dominant: allele that is expressed (regardless of its counterpart allele); represented by a capital letter (e.g. T) Recessive: allele that is expressed only when its counterpart allele is also recessive ; represented by a small letter (e.g. t) Examples of traits in pea plants
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10. GENOTYPE AND PHENOTYPE Genotype of alleles: P = purple flower p = white flower All genes occur in pairs, so 2 alleles affect a characteristic Possible combinations are: Genotypes PP Pp pp Phenotypes purple purple white
14. BREED THE P1 GENERATION P1 = tall (TT) x short (tt) pea plants T T t t
15. BREED THE P1 GENERATION: SOLUTION P1 = tall (TT) x short (tt) pea plants t t T T Tt Tt Tt Tt All Tt = tall (heterozygous tall) produces the F 1 generation
16. BREED THE F1 GENERATION F1 = tall (Tt) x tall (Tt) pea plants T t T t
17. BREED THE F1 GENERATION: SOLUTION F1 = tall (Tt) x tall (Tt) pea plants T t T t TT Tt Tt tt produces the F 2 generation 1/4 (25%) = TT 1/2 (50%) = Tt 1/4 (25%) = tt 1:2:1 genotype 3:1 phenotype
18. FOLLOWING THE GENERATIONS Cross 2 pure plants TT x tt Results in all hybrids Tt Cross 2 hybrids, results in 3 Tall & 1 Short TT, Tt, tt
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