Heritability

Question 1

phenotype =

Answer 1

genotype + environment

Question 2

Polygenic inheritance

Answer 2

many genes influence one trait

Question 3

additive effects

Answer 3

when several effects are added together to influence

Question 4

gene interaction

Answer 4

genes interact with several factors

Question 5

interactive effects

Answer 5

two or more loci interact on 1 trait

Question 6

E locus

Answer 6

extension

Question 7

D locus

Answer 7

diluter

Question 8

Hypotasis

Answer 8

gene that is masked

Question 9

temperature sensitive tyrosinase

Answer 9

colour point mutation
- when cold there is no production of that colour

Question 10

Heritability

Answer 10

assessment of how successfully or quickly a trait can be improved by selection

Question 11

broad sense heritability equation

Answer 11

h^2B= genetic variance / phenotypic variance

Question 12

narrow sense heritability equation

Answer 12

h^2 = additive genetic variance / phenotypic variance

Question 13

what does the narrow sense heritability measure?

Answer 13

strength of the relationship between performance & breeding value for a specific trait

Question 14

what is the heritability estimate based on?

Answer 14

based on how much relatives resemble each other

Question 15

regression (r)

Answer 15

correlation coefficient

Question 16

what type of traits have high/moderate/low heritability?

Answer 16

growth- high
behaviour- moderate
reproductive- low

Question 17

what are 2 causes of low heritability

Answer 17

1. high environmental influence
2. complicated inheritance

Question 18

what is the highest h2 value in companion animals

Answer 18

trainability

Question 19

Repeatability

Answer 19

measure of consistency between phenotypic values

Question 20

does repeatability look at single or multiple animals?

Answer 20

single animals