7.3 Quantitative Genetics

Question 1

Quantitative traits show

Answer 1

Continuous variation such as a large range of phenotypes

Ex: height, weight, intelligence

Question 2

Polygenic

Answer 2

Characteristics built upon many genes

Question 3

Variation is due to?

Answer 3

Both genetic and environmental differences

Continuous variation

Question 4

Mean

Answer 4

Sum of all phenotypic values divided by the number of individuals

(Same as avg.)

Question 5

Variance

Answer 5

A measure of how much variability there is in a population

Low to high

Question 6

Polygenic Traits

Answer 6

Quantitive traits with continuous variation

Question 7

Polygenic Traits have?

Answer 7

More than one allele and are a result of several genes

Ex: eye color-64 genes

Question 8

Heritability

Answer 8

Proportion of the variation within a population due to genetic differences among individuals

Question 9

How can Heritability be determined?

Answer 9

Through correlation

Question 10

Natural experiments

Answer 10

Situations in which either the overlap in genes or environment is removed

Question 11

Who is often used for Natural Experiments?

Answer 11

Twins

Question 12

Heritability of IQ in twins is estimated to be…?

Answer 12

.52

Question 13

Drawback

Answer 13

Limited number of twins to study

Question 14

The IQ for Monozygotic twins that are raised apart is estimated to be…?

Answer 14

.72