ANSC 4395 BREEDING & GENETICS FINAL
EXAM WITH REAL QUESTIONS AND
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
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)
EXAM WITH REAL QUESTIONS AND
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
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)
