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Published byFelicity Martha Maxwell Modified over 9 years ago
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What you should remember from Genetics Presented by: Deoxyribonucleic Awesome AKA: Justine, Deonna, Anam and Raquel
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Overview: Pedigrees Genotypes/Phenotypes Types of Dominance Relation to Bio 112
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Genotypes and Phenotypes: Differences? Genotype: The genetic makeup, or set of alleles, of an organism Geno.: Pheno.: DD, Ddblue fish (dominant) Ddred fish (recessive) Phenotype: The observable traits of an organism
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Types of Dominance Complete dominance: One allele is completely dominant over the other. Example: If one parent has brown eyes (BB) and the other parent has blue eyes (bb), the offspring will have brown eyes. Allele Contribution to Phenotype B Brown eyes (dominant) b Blue eyes (recessive) Genotype Phenotype BB Brown eyes (dominant) Bb Brown eyes (dominant) bb Blue eyes (recessive)
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Incomplete Dominance: When two alleles together produce a third phenotype Ex. Flower colors: A red flower (RR) and a white flower (rr) will produce a pink flower (Rr). Allele Contribution to Phenotype R Red (incomplete dominance) r White (incomplete dominance) Genotype Phenotype RR Red Rr Pink (intermediate between red and white) rr White
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Co-Dominance: When both alleles express themselves Example: Genotype Phenotype I^A I^A Type A I^BI^B Type B ii Type O I^A i Type A I^B i Type B I^AI^B Type AB
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Relation to Bio 112: Evolution Hardy-Weinberg Principle (p + q = 1)
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