Exam 2 L5 - Mendelian genetics

Exam 2 L5 - Mendelian genetics - Mendelian Genetics...

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Mendelian Genetics Genotype - The actual genetic make-up of the organism Phenotype - A physical characteristic (or function) that is observable SO: physical characteristics (phenotypes) are dependent upon genetic make-up (genotype) Allele - alternative forms of a single gene Homozygous – identical alleles of a gene Heterozygous – different alleles of a gene Dominant allele: in a heterozygote, the allele that determines the phenotype Recessive allele: in a heterozygote, the allele that has no noticeable effect on the phenotype - in a heterozygous blend, the dominant allele will determine the phenotype Crossing homozygous dominant s result in “pure bred” offspring Crossing a homozygous dominant and a homozygous recessive - “reduction” through meiosis - F-1 generation yields heterozygous offspring (peas that are Yy) -genotype is Yy; phenotype is yellow Crossing F-1 generations with each other results in an F-2 generation: - pea genotype occurs in a 1 – 2 – 1 proportion (1YY; 2Yy; 1yy)
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Exam 2 L5 - Mendelian genetics - Mendelian Genetics...

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