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GENDER - Coggle Diagram
GENDER
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Chromosomes and Hormones
Role of chromosomes
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23rd pair of chromosomes, the last one, determines the biological sex, and consists of either XX or XY
They are a threadlike structure of nucleic acids and protein found in the nucleus of most living cells, carrying genetic information in the form of genes.
Human ovaries produce egg cells which carry an X chromosome, Sperm cells carry either an X or a Y, this determines the baby's sex
SRY gene
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Causes a fetus to develop male gonads (testes) and prevents the development of female reproductive structures (uterus and fallopian tubes).
Found in the Y chromosome, the sex determining gene, it is responsible for male sex development
Role of hormones
Testosterone
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Produced mainly in the male testes, in very small amounts in the female ovaries
Associated with aggression, Nanne Van de Poll found that female rate who were injected with testosterone showed more physical and sexual aggression than controls
Starts being produced at about 8 weeks gestation, controls the development of male sex organs
Oxytocin
Reduces cortisol, the stress hormone, allowing new mothers to bond with thier babies and reducing the fight or flight response, making mothers prioritise caring for a baby
Men produce less oxytocin, and testosterone dampens its effects, this fuels the stereotype that men are less interested in relationships and intimacy
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Oestrogen
Small amounts are in males, reducing body fat and maintaining sex drive
Has also been suggested to cause high emotions and irritability during the menstrual cycle, some researchers dispute the existence of PMS and in some cases it has been used as defense for crimes even as serious as murder
The main female hormone, is important to the menstrual cycle and reproductive system, determining female sex characteristics
What are they
Hormones can influence gender development, chromosomes can't
In the womb, hormones cause the development of reproductive organs
Chemical substances which circulate in the blood, controlling and regulating activities in certain cells and organs
They trigger the development of secondary sex characteristics in puberty, such as pubic hair, breasts
Evaluation
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Weaknesses
Conflicting theories-
SLT may be more appropriate as it considers the importance of cultural influence on gender such as gender role stereotypes
Population validity-
Many studies on biological factors in sex have small samples of unusual people such as van goozen or they're on animals
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Conflicting evidence-
Tricker injected men with either testosterone or a placebo for 10 weeks and saw no significant difference in behaviour
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