Animal Management > EXAM > Stutts - ANSC 4395 Breeding & Genetics - Test 3 QUESTIONS AND ANSWERS 100% CORRECT (All)
Stutts - ANSC 4395 Breeding & Genetics - Test 3 QUESTIONS AND ANSWERS 100% CORRECT
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Simply-Inherited Traits Correct Answer: traits affected by only a few genes qualitative or categorical affected little by environment Quantitative Correct Answer: measured with numbers Polyg ... enic Traits Correct Answer: Affected by many genes with no gene having an overriding influence. - EX: Growth rate, milk production, ribeye area Typically quantitative or continuous in expression. - Phenotypes are usually described by numbers Greatly influenced by environment Examples of Simply-Inherited Traits Correct Answer: Coat color, horns Examples of Polygenic Traits Correct Answer: Weaning weights, milk yield, REA... CANT DO TEST MATINGS FOR THIS TYPE OF TRAIT Threshold Traits Correct Answer: Polygenic traits that have categorical phenotypes - Pregnancy, dystocia, gait - Influenced by many genes but have an either/or result Which traits are more important? Correct Answer: Polygenic traits, traits that determine profitability and productivity EX) Growth rate, fertility, milk production Niche markets Correct Answer: markets more sensitive to simply-inherited traits Simply Inherited Correct Answer: Genetic Defects Common characteristics of Polygenic and Simply Inherited Correct Answer: 1. Both are subject to the same Mendelian Mechanisms: Law of Segregation and Independent Assortment 2. Affected by dominance and epistasis 3. Principles of selection and mating apply to both - Attempt to increase frequency of desirable alleles (More difficult to do with polygenic traits) Function of the Number of genes involved Correct Answer: - The more genes involved, the more DIFFICULT it is to observe the effects of individual genes, and therefore the less specific info we have about those genes - When a few or one gene affects a trait, the effects of those genes are well understood (Exact genotype may not be known, [Show More]
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