Quantitative Genetics Flashcards Preview

Plant Genetics and Crop Improvement > Quantitative Genetics > Flashcards

Flashcards in Quantitative Genetics Deck (19)
Loading flashcards...
1
Q

Quantitative traits are referred to as ?

A

quantitative traits

2
Q

HOw are quantitative traits most often measured?

A

by a numerical value such as yield or plant height

3
Q

How many genes control a quantitative trait?

A

more than 2. often unknown or in the hundreds

4
Q

How are complex genes inherited?

A

in a mendelian manner. however, influence of individual genes is hard to measure

5
Q

How do we work with quantitative traits?

A

Statistics

6
Q

What can influence quantitative traits other than genetics?

A

environment

7
Q

What is the formula for calculating variance?

A

P = G + E + GE

8
Q

P?

A

P = phenotype

9
Q

G?

A

G = genetic contribution to the phenotype

10
Q

E?

A

E = environmental effects

11
Q

GE?

A

interaction between genotype and environment

12
Q

additive effects?

A

AA=4, Aa = 2, aa = 0

13
Q

How much dominant gene action is expected in a population of inbred individuals?

A

Inbred individuals would be highly heterozygous. Expression of dominant gene action depends on heterozygosity. little to no dominance gene action action in a population of inbreds.

14
Q

heritabilty?

A

the degree to which a character is heritable is a function of the relative contribution of the genotype and the environment to the expression of the phenotype of the individual

15
Q

Broad sense heritability?

A

calculated using total genetic variance

16
Q

narrow sense heritability?

A

calculated using only the additive portion of the genetic variance

17
Q

heritability estimates are a function of the

A

population under investigation

18
Q

selection units?

A

unit upon which selection is applied

19
Q

selection differential?

A

difference between the mean performance of the population and the mean performance of the selected group