Methods In Behavior Genetics

Question 1

Alleles

Answer 1

A= normal
a= mutant

Question 2

Genotypes

Answer 2

AA= homozygous wild (normal)
aa= homozygous mutant (affected)
Aa= heterozygous (carrier)

Question 3

Genotype frequency

Answer 3

Known with allele frequency:
A= 50% a=50%
AA= 0.5•0.5=0.25
Aa= 2•0.5•0.5=0.5
aa= 0.5•0.5=0.25

If dominant then likelyhood is 75% if recessive then 25%

Question 4

Hardy-Weinberg Equilibrium (HWE)

Answer 4

P^2+2pq+q^2=1

Question 5

Family studies

Answer 5

Measure resemblance between parents and child

Question 6

Adoption studies

Answer 6

Data is rare, biological parents and adoptive parents tested

Question 7

Adoption studies II

Answer 7

Siblings both biological and environmental were compared

Question 8

Twin studies logic

Answer 8

MZ correlation = DZ correlation > genes not important
MZ c.> DZ c. = genes important

Question 9

Genetic and environmental components

Answer 9

P= A (gene effects)+ D (dominance effect)+ C (shared environment)+ U (unique environment)