Ch. 10 Flashcards Preview

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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.

2

Accuracy of seletion

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

3

Selection intensity

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

4

Genetic Variation

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

5

Generation interval

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

6

Rate of Genetic Change or Response to Selection

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

7

Accuracy of Selection

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

8

Selection Criterion

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

9

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.

10

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.

11

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

12

Proportion Saved (p)

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

13

Effective Proportion Saved

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

14

Generation Interval (L)

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

15

Closed POp

A pop that is closed to genetic material from the outside

16

Genetic trend

Change in the mean breeding value of a pop over time

17

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

18

Progeny Test

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

19

Replacement rate

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

20

Selection Risk

The risk that the true breeding values of replacements will be significantly poorer than expected