week 3

Question 1

from gene to behaviour

kallman syndrome

Answer 1

1856 post-mortem of 40 year old man 
- no sense of smell 
- no olfactory bulbs in brain
- small penis 
- very small testicles
- no libido 
rare genetic disorder - runs in families 
(do more research on this?)

Question 2

reasons for reduced behavioural libido

Answer 2

• low testosterone
• reduced gonadotropins, LH and FSH
• GnRH is absent and not entering the pituitary
• there are no GnRH cells in the brain
• there is no protein produced by gene Xp-22.3

Question 3

patterns of inheritance

Answer 3

X linked recessive - gene on the x, less effect on females, but females can be carriers
Y linked - gene on Y, only males affected, all sons of a man with this disorder will be affected
Autosomal recessive - requires two copies to develop disorder 1 copy and you are a carrier
Autosomal dominant - 1 copy sufficient to develop disorder, men and women affected equally, children with those disorder have 50% chance of developing it too

Question 4

two questions about the roles of genotype and experience must not be confused

Answer 4

Q1: accounting for differences in behaviour between individuals
Q2: explaining the development of behaviour in the individual (nature/nurture issue)

Question 5

what does ‘interaction’ mean

Answer 5

• genetic influence varies with the environment

- environmental influence varies with the genotype her

Question 6

heritability meaning

Answer 6

proportion of variation due to genetic variation between individuals
Can have a heritability of 0 or 1, 0 being environment and 1 being genotype
increases with socioeconomic status

Question 7

hebb’s analogy

Answer 7

there is a single behaviour that is inextricably the product of both genotype and environment

Question 8

philosophical debates for nature nurture

Answer 8

Nurture - John Locke the blank slate