ANSC 4395 FINAL EXAM QUESTIONS & ANSWERS
Measured - Answers -Quantitative traits are those that can be __________________.
Weights
Heights
Litter size
Number of eggs
Racing speed - Answers -Some examples of quantitative traits
Many pairs of genes - Answers -Quantitative traits are controlled by
One pair - Answers -Effects of _______ _________ of genes cannot be distinguished.
Identical - Answers -The activity at any one pair of genes is ______________ to the
types of gene action discussed in simply-inherited traits.
Phenotype - Answers -The outward appearance of an individual.
Measurement - Answers -The phenotype for quantitative traits is usually a
_____________________.
Sum - Answers -The __________ of the genetic and environmental factors which have
an effect.
P = G + E - Answers -Formula for phenotype
Subdivided - Answers -Both genetic and environmental factors can be
___________________ into more explicit components.
Additive effects
Dominance effects
Epistatic effects - Answers -Genetic effects can be divided into
Additive Effect - Answers -Occur when two or more genes source a single contribution
to the final phenotype.
Dominance Effect - Answers -Phenomenon of one variant (allele) of a gene on a
chromosome masking or overriding the effect of a different variant of the same gene on
the other copy of the chromosome.
Epistatic Effect - Answers -The phenomenon where the effects of one gene are
modified by one or several other genes at different loci.
, Not - Answers -Dominance is ______ always complete.
Heterozygote - Answers -__________________ is exactly half way between the
homozygotes.
Selection decisions - Answers -When dominance is present, it affects our ability to
make what?
Selection - Answers -If a trait is controlled by many pairs of genes with additive gene
action, it will be easier to make improvement through ___________________.
Epistasis - Answers -Interaction among genes at multiple loci.
Epistasis - Answers -May have interaction between 2, 3, or more loci.
Constant - Answers -Gene action at one locus may not be _______________.
Temporary environmental effects - Answers -These are sources of environmental
variation that have somewhat of a temporary effect.
Permanent environmental effects - Answers -Change the way an animal performs for
the rest of its life.
Variance - Answers -_______________ is the square of the standard deviation.
Best additive genotype
Best dominance genotype
Best epistatic genotype
Best permanent environment genotype
Best temporary environment genotype - Answers -The best animals may have:
Heritability - Answers -The proportion of the phenotypic variation which is due to
additive gene effects.
Heritability - Answers -The most important single concept in animal breeding.
h^2 - Answers -Heritability is symbolized as
Heritability - Answers -Provides information about differences between individuals and
the nature of the variation within a population.
From herd to herd
Within a herd if management changes - Answers -Heritability is not constant, is varies...
Heritability - Answers -Makes it much easier to show selection progress for growth and
carcass traits than for reproductive traits.
Measured - Answers -Quantitative traits are those that can be __________________.
Weights
Heights
Litter size
Number of eggs
Racing speed - Answers -Some examples of quantitative traits
Many pairs of genes - Answers -Quantitative traits are controlled by
One pair - Answers -Effects of _______ _________ of genes cannot be distinguished.
Identical - Answers -The activity at any one pair of genes is ______________ to the
types of gene action discussed in simply-inherited traits.
Phenotype - Answers -The outward appearance of an individual.
Measurement - Answers -The phenotype for quantitative traits is usually a
_____________________.
Sum - Answers -The __________ of the genetic and environmental factors which have
an effect.
P = G + E - Answers -Formula for phenotype
Subdivided - Answers -Both genetic and environmental factors can be
___________________ into more explicit components.
Additive effects
Dominance effects
Epistatic effects - Answers -Genetic effects can be divided into
Additive Effect - Answers -Occur when two or more genes source a single contribution
to the final phenotype.
Dominance Effect - Answers -Phenomenon of one variant (allele) of a gene on a
chromosome masking or overriding the effect of a different variant of the same gene on
the other copy of the chromosome.
Epistatic Effect - Answers -The phenomenon where the effects of one gene are
modified by one or several other genes at different loci.
, Not - Answers -Dominance is ______ always complete.
Heterozygote - Answers -__________________ is exactly half way between the
homozygotes.
Selection decisions - Answers -When dominance is present, it affects our ability to
make what?
Selection - Answers -If a trait is controlled by many pairs of genes with additive gene
action, it will be easier to make improvement through ___________________.
Epistasis - Answers -Interaction among genes at multiple loci.
Epistasis - Answers -May have interaction between 2, 3, or more loci.
Constant - Answers -Gene action at one locus may not be _______________.
Temporary environmental effects - Answers -These are sources of environmental
variation that have somewhat of a temporary effect.
Permanent environmental effects - Answers -Change the way an animal performs for
the rest of its life.
Variance - Answers -_______________ is the square of the standard deviation.
Best additive genotype
Best dominance genotype
Best epistatic genotype
Best permanent environment genotype
Best temporary environment genotype - Answers -The best animals may have:
Heritability - Answers -The proportion of the phenotypic variation which is due to
additive gene effects.
Heritability - Answers -The most important single concept in animal breeding.
h^2 - Answers -Heritability is symbolized as
Heritability - Answers -Provides information about differences between individuals and
the nature of the variation within a population.
From herd to herd
Within a herd if management changes - Answers -Heritability is not constant, is varies...
Heritability - Answers -Makes it much easier to show selection progress for growth and
carcass traits than for reproductive traits.
