Intro to Animal Sciences Week 3

Intro to Animal Sciences Week 3 - Intro to Animal Sciences...

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Intro to Animal Sciences Week 3 Genetics Genetics The science of dealing with heredity and variation o Heredity is the transmission of physical What does DNA and RNA stand for? o Deoxyribonucleic acid o Ribonucleic acid Gene - Unit of heredity Chromosome - circular DNA molecule Homozygous - (Homo) genes on the chromosome are the same Heterozygous - (Hetero) genes on the chromosome are different Phenotype - The appearance of performance of an animal determined by the genotype Genotype - Determine by o Breeding value- (what gees are present) o Non Additive Value- (How genes are combined) Dominant- A gene whose effect masks the phenotypic expression of the allele Recessive- A gene whose expression is hidden by the dominant gene Types of Dominance 1. Complete - Shows equal performance of homozygous Dominant (AA) and Heterozygous (aa) 2. Incomplete - When the heterozygote is intermediate as to the expression of the trait 3. Over - dominance - a condition in genetics where the phenotype of the heterozygote lies outside of the phenotypical range.
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