Quantitative Genetics (24)

Question 1

Discontinuous traits

Answer 1

No gradient/bell curve

Question 2

Quantitative characteristics

Answer 2

Each genotype may produce a range of possible phenotypes

Question 3

Meristic

Answer 3

Whole #

Question 4

Threshold characteristics

Answer 4

Presence/absence of a trait (EG susceptibility to a disease- continuous, but you either have it or you don’t)

Question 5

Wuantitative characteristics vary ________ and many are influenced by alleles at __________

Answer 5

continuously, more than one loci

Question 6

A+A+B+B+ x A-A-B-B-

Answer 6

Different numbers of positive alleles, creating differing genotypes/phenotypes

Question 7

Phenotypic variation isn’t solely genetic- it also depends on ___________

Answer 7

Environment

Question 8

Vp= Vg+Ve+Vge

Answer 8

Phenotypic variance=genotypic variance+ environmental variance+ Genetic-environmental interaction variance

Question 9

Genetic environmental interaction

Answer 9

When effects of a gene depend on environment

Question 10

Vg=Va+Vd+Vi

Answer 10

Genetic variance= additive variance+dominance genetic variance+ genetic interaction variance

Question 11

Vp=Va+Vd+Vi+Ve+Vge

Question 12

Heritibility is used to estimate the __________-

Answer 12

proportion of variation that’s genetic

Question 13

Natural selection

Answer 13

Arises through differential reproduction of individuals with different genotypes (Ones that have genotypes letting them survive reproduce)

Question 14

Artificial selection-

Answer 14

Breeding organisms with desired traits

Question 15

Response to selection

Answer 15

R=h^2(additive variation) * S(Selection differential- difference between mean ohenotype of selected parents vs original population)