Ch. 10 Flashcards
Key equation
The equation relating the rate of genetic change resulting from selection to four factors: accuracy of selection, selection intensity, genetic variation, and generation interval.
Accuracy of seletion
A measure of the strength of the relationship between true breeding values and their predictions for a trait under selection.
Selection intensity
A measure of how “choosy” breeders are in deciding which individuals are selected
Genetic Variation
Variability of breeding values within a population for a trait under selection
Generation interval
the amount of time required to replace one generation with the next
Rate of Genetic Change or Response to Selection
The rate of change in the mean breeding value of a pop. caused by selection
Accuracy of Selection
The correlation between true breeding values and their predictions for a trait under selection
Selection Criterion
An EPV, EPD, phenotypic value, or other pieces of info forming the basis for selection decisions
Selection Intensity
The difference between the mean selection criterion of those individuals selected to be parents and the avg. selection criterion of all potential parents, expressed in standard deviation units.
Selection Differential
The difference between the mean selection criterion of those individuals selected to be parents and the avg. selection criterion of all potential parents, expressed in units of the selection criterion.
Truncation Selection
Selection on the basis of a distant division in the selection criterion (point of truncation) above which individuals are kept and below which they are rejected
Proportion Saved (p)
The # of individuals chosen to be parents as a proportion of the # of potential parents
Effective Proportion Saved
In selection- a value that, when substituted for actual proportion saved (p), reflects correct selection intensity
Generation Interval (L)
(in a closed pop): The avg. age of parents when their selected offspring are born
Closed POp
A pop that is closed to genetic material from the outside
Genetic trend
Change in the mean breeding value of a pop over time
Phenotypic Selection Differential (S)
The difference between the mean performance of those individuals selected to be parents and the avg. performance of all potential parents, expressed in units of the trait
Progeny Test
A test used to help predict an individual’s breeding values involving multiple matings of that individual and evaluation of its offspring
Replacement rate
The rate at which newly selected individuals replace existing parents in a pop,
Selection Risk
The risk that the true breeding values of replacements will be significantly poorer than expected
