Behavioural genetics 2

Question 1

Dichotomous traits

Answer 1

One form or another never in combination- not on a spectrum like extraversions and introversion

Question 2

Terms

Answer 2

Phenotype- trait e.g. yellow vs green
Genotype- genetic material e.g. GG
Allele- different forms of a gene that control the same trait e.g. G vs y
Heterozygous- Gy
Homozygous- GG or yy
G is dominant to y
y is recessive to G

Question 3

Tryptophan hydroxylase gene

Answer 3

Cells with this gene make 80% less serotonin that cells with the more common gene
This gene is found more often in depressed patients

Question 4

Serotonin transporter

Answer 4

The gene has 2 forms- long and short
The short form is sometimes linked to depression and sometimes isn’t
Higher brain activation to negative emotions
The environment- stress
More short forms you have more likely to be depressed
But only when combined with stressful life events

Question 5

Chromosomes are made of DNA

Answer 5

Made up of
Adenine (A) and Thymine (T)
and
Cytosine (C) and Guanine (G)