Ch. 5 Flashcards Preview

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Flashcards in Ch. 5 Deck (11):
1

Simply-inherited traits*

A trait affected by only a few genes

2

Qualitative or categorical traits *

A trait in which phenotypes are expressed in categories

3

Quantitative trait*

A trait in which phenotypes show continuous (numerical) expression

4

Polygenic traits *

a trait by many genes, no single gene having an overriding influence

5

Dystocia*

Difficulty in giving birth

6

Threshold traits*

A polygenic trait in which phenotypes are expressed in categories

7

test matings*

a mating designed to reveal the genotype of an individual for a small # of loci

8

Simply Inherited traits characteristics

Qualitative and affected very little by the environment

9

Polygenic traits characteristics

quantitative and affected by the environment.
also tend to be more important than SI

10

Common characteristics

Mendelian Laws apply to both; Basic tools of animal breeding are the same; Mating system Hardy-Weinburg Equilibrium the same

11

Different Approaches to breeding

SI: Testing mating
Polygenic: too many genes to examine single loci