Flashcards in Ch. 7 Deck (24):
The branch of genetics concerned w/ influences on, measurement of, relationships among, genetic prediction for, and rate of change in traits that are or can be treated as quantitative.
Phenotypic value (P)
A measure of performance for a trait in an individual- a performance record
The avg. phenotypic value of all individuals in a population.
Genotypic Value (G)
The effect of an individual's genes (singly & in combination) on its performance for a trait.
The effect that external (nongenetic) factors have on animal performance.
(in animal breeding) Any measure applied to an individual as opposed to a pop. Exs. are phenotypic value, genotypic value, breeding value, & environmental effect.
The value of an individual as a (genetic) parent
Independent Gene Effect
The effect of a gene independent of the effect of the other gene at the same locus (dominance) and the effects of genes at other loci (epistasis)
The part of an individual's genotypic value that is due to independent and therefore transmittable gene effects.
Estimated Breeding Value
A prediction of a breeding value
Progeny Difference (PD) or Transmitting Ability (TA)
Half an individual's breeding value- the expected difference between the mean performance of the individual's progeny and the mean performance of all progeny (assuming randomly chosen mates)
Expected Progeny Difference (EPD), Predicted Difference (PD), or Estimated Transmitting Ability (ETA)
A prediction of a progeny difference
Additive Gene Effect
independent gene effect
Additive Genetic Value or Additive Value
Gene Combination Value (GCV)
The part of an individual's genotypic value that is due to the effects f gene combinations (dominance and epistasis) and cannot, therefore, be transmitted from parent to offspring
Gene Combination Effect
The effect of a combination of genes, i.e. a dominance or epistatic effect
Nonadditive Gene Effects
Gene combination effects
Nonadditive Genetic Value or Nonadditive Value
Gene combination value
A trait for which individuals commonly have more than one performance record.
Producing Ability (PA)
The performance potential of an individual for a repeated trait.
Permanent Environmental Effect
A environmental effect that permanently influences an individual's performance for a repeated trait.
Temporary Environmental Effect
An environmental effect that influences a single performance record of an individual, but does not permanently affect the individual's performance potential for a repeated trait
Most Probable Producing Ability (MPPA)
A prediction of producing ability