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ANSC 4395 Breeding & Genetics FINAL Exam With 100% Correct And Verified Answers
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ANSC 4395 Breeding & Genetics FINAL Exam With 100% Correct And Verified Answers
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ANSC 4395 Breeding & Genetics FINALExam With 100% Correct And Verified
Answers
Simply-Inherited Traits: - Correct Answer-Traits affected by only a few
genes
EX: Coat color, Horns
Simply-inherited Traits:
-Qualitative or categorical - Correct Answer-Either/or expression
EX: Black or red, Horned or polled
Simply-inherited Traits are rarely... - Correct Answer-quantitative
(Measured with numbers or continuous)
EX: White spotting in cats (1-9 numerical rating)
Simply-inherited Traits are typically, affected very little by... - Correct
Answer-environment
EX: Chocolate lab may bleach out if left in the sun, but there is no
mistaking it for a black or yellow lab
Polygenic Traits: - Correct Answer-Affected by many genes with no gene
having an overriding influence
EX: Growth rate, Milk production, Ribeye area
Polygenic Traits are typically... - Correct Answer-quantitative or
continuous in expression
-Phenotypes are usually described by numbers
EX: Weaning weights, Milk yield, Ribeye Area
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, Polygenic Traits are greatly influenced by... - Correct Answer-environment
-Lack of feed
-Heat/cold stress
-Training of quarter horses (speed)
Some polygenic traits have categorical phenotypes, called what? - Correct
Answer-Threshold Traits
-Pregnancy (pregnant or not pregnant)
-Dystocia (1-5)
-Natural gait (trotter or pacer)
-Influenced by many genes but have an either/or result
Between simply-inherited and polygenic traits, which is more important? -
Correct Answer-Typically, polygenic traits
-Growth rate, fertility, milk production
-Traits that determine productivity and profitability
Traits: Some markets are more sensitive to... - Correct Answer-simply-
inherited traits
-Coat or feather color
-Polled
Genetic defects are usually... - Correct Answer-simply-inherited
Common Characteristics of Simply-inherited & Polygenic Traits: - Correct
Answer--Both are subject to the same Mendelian mechanisms (Laws of
segregation & independent assortment)
-Dominance and epistasis affect both
-Principles of selection and mating apply to both (attempt to increase the
frequencies of favorable alleles)
Different Breeding Approaches-
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
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