D2 - Bio 311D: Introductory Biology II Discussion #2 Todays...

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Today’s topics Genetics Quiz Bio 311D: Introductory Biology II Discussion #2
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Genetics: Key concepts Gene, allele, and loci Gene functional units of information about inherited traits particular location on a particular chromosome Alleles One of alternative forms of a particular gene Loci the specific location of a gene or DNA sequence on a chromosome ( from Wiki )
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Homozygous : two copies of the same allele Example: AA or aa Heterozygous : two different alleles of a given gene Example: Aa Genotype : an organism’s allele makeup Phenotype : the outward appearance or expression of an orgasm
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Relationship between alleles Example 1. Given gene that control the color of leaves in plant Allele A: red pigment on leaf Allele a: no pigment Genotype Phenotype Allele relationship AA Red leaf A > a Complete dominant A is dominant a is recessive Aa Red leaf aa Transparent leaf Heterozygous phenotype is same as one of the parents
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Mendel Genetics: Monohybrid Cross Punnett square Q . Why garden pea?
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Mendel Genetics: Dihybrid Cross
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First law: Segregation of characteristics Each gamete receives only one of each parent’s pair of genes for each trait. When a sperm fertilizes an egg, the resulting offspring receives one allele from the father and one from the mother Second law: independent assortment The alleles for one trait may distributed to the games independently of the alleles for the other traits. Mendel Laws
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Example 2. Given gene that control the color of leaves in plant Allele A: red pigment on leaf Allele A’: white pigment Genotype Phenotype Allele relationship AA Red leaf Incomplete dominant AA’ Pink leaf A’A’ White leaf Heterozygous phenotype is intermediate between two parents
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D2 - Bio 311D: Introductory Biology II Discussion #2 Todays...

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