Flashcards in Ch. 10 Deck (20):

1

## 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.

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## Accuracy of seletion

### A measure of the strength of the relationship between true breeding values and their predictions for a trait under selection.

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## Selection intensity

### A measure of how "choosy" breeders are in deciding which individuals are selected

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## Genetic Variation

### Variability of breeding values within a population for a trait under selection

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## Generation interval

### the amount of time required to replace one generation with the next

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## Rate of Genetic Change or Response to Selection

### The rate of change in the mean breeding value of a pop. caused by selection

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## Accuracy of Selection

### The correlation between true breeding values and their predictions for a trait under selection

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## Selection Criterion

### An EPV, EPD, phenotypic value, or other pieces of info forming the basis for selection decisions

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## 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.

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## 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.

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## 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

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## Proportion Saved (p)

### The # of individuals chosen to be parents as a proportion of the # of potential parents

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## Effective Proportion Saved

### In selection- a value that, when substituted for actual proportion saved (p), reflects correct selection intensity

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## Generation Interval (L)

### (in a closed pop): The avg. age of parents when their selected offspring are born

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## Closed POp

### A pop that is closed to genetic material from the outside

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## Genetic trend

### Change in the mean breeding value of a pop over time

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## 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

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## Progeny Test

### A test used to help predict an individual's breeding values involving multiple matings of that individual and evaluation of its offspring

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## Replacement rate

### The rate at which newly selected individuals replace existing parents in a pop,

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