chromosomes and hormones

Question 1

explain influence of chromosomes

Answer 1

humans have 23 pairs of chromosomes and the 23rd pair determines the biological sex

Question 2

the Y chromosome

Answer 2

the Y chromosomes contains the SRY gene which causes androgens to be produced in the male embryo

Question 3

how is gender development governed by hormones

Answer 3

prenatally hormones act upon brain development and cause the development of reproductive organs.
At puberty a burst of hormonal activity triggers secondary sexual characteristics such as pubic hair

Question 4

explain the role of testosterone

Answer 4

controls the development of male sex organs before birth.
High levels of testosterone are linked to aggression because such behaviour is adaptive for males

Question 5

explain the role of oestrogen

Answer 5

oestrogen controls female sexual characteristics including menstruation

Question 6

explain the role of oxytocin

Answer 6

stimulates lactation post birth, stimulates bonding, reduces stress hormone cortisol

Question 7

research evidence to support the role of hormones - testosterone

Answer 7

Gorski et al. injected female rats with testosterone prebirth. Female rats developed male characteristics and had a more masculinised brain, tried to mate with other females. Proves influence of hormones on sexual development

Question 8

research evidence to support hormones on gender - dr money

Answer 8

boy had routine circumcision go wrong, penis burnt off. Dr money suggested to raise boy as a girl. At puberty behaved in a masculine fashion and became suicidal. Told the truth and converted back to a man.
Supports the role of hormones and gender on personality. Nature superior to nurture.