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Biological Explanations of Gender Development

Core Biological Foundations

Biological explanations focus on how innate genetic and hormonal factors influence an individual’s development and behaviour in relation to gender.

1

Chromosomal Influence

Sex determination (XY/XX) and the SRY gene mechanism.
2

Hormonal Factors

Testosterone, Oestrogen, and Oxytocin shaping development.
3

Brain Structure

Observed structural differences influenced by hormones.
4

Limitations & Interactionism

The critique of determinism and the role of environment.

Chromosomal Sex: The SRY Trigger

The Foundation of Development

Chromosomal sex is established at conception (Males typically XY, Females typically XX). The SRY gene on the Y chromosome is crucial in initiating male development by causing the undifferentiated gonads in the embryo to become testes. Testes produce testosterone promoting male characteristics.

Key Hormones in Gender Development

Hormones are chemicals released into the bloodstream that regulate bodily functions and affect behaviour, including gender-related behaviours.

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Testosterone

Produced mainly in the testes; acts prenatally to masculinize neural circuits; influences aggression, spatial ability, and gender-typical play.
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Oestrogen

Predominantly produced by ovaries; helps develop female genitalia and secondary sexual characteristics; influences feminine-typical behaviours.
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Oxytocin

The “love hormone”; influences gender-related behavioural differences, especially social interaction patterns, which often differ between males and females.

Animal Studies: Hormonal Shaping

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Critical Period Exposure: Animal research supports the influence of hormones. Female rodents exposed to testosterone in utero show more “male-typical” behaviours such as increased aggression and mounting. This suggests hormonal exposure during critical developmental periods can shape later gender-typical behaviours.

Observed Brain Structure Differences

Research has found some differences in brain structures between males and females, believed to be influenced by chromosomes and hormones.

A

Hypothalamus

Involved in sexual behaviour regulation, this area differs between sexes.
B

Amygdala Volume

Some studies suggest males have larger amygdala volume (related to emotion and aggression).
C

Cortical Connectivity

Female brains may show greater connectivity in areas involved in language and social cognition.

Biological Model: Strengths vs. Weaknesses

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StrengthsThese approaches emphasize that biological mechanisms set the foundation for whether an individual is male or female and how masculine or feminine behaviours develop.
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LimitationsBiological models may overemphasize genetic and hormonal causes without considering the powerful role of environment and social context. Biology is not deterministic (e.g., atypical syndromes).

Interactionist View

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If hormones influence behaviour so much, is environment or culture irrelevant?
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Not at all. The modern view sees biology as a foundation, but personal experiences, learning, and culture shape the expression of gender identity and behaviour (Interactionist Perspectives).
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Biological Gender Development Deck
Term
Chromosomes & Biological Sex

What chromosomes typically determine biological sex in humans?

Answer
Biological Sex Chromosomes

Males have XY chromosomes, and females have XX chromosomes.

Term
SRY Gene Role

What role does the SRY gene play in gender development?

Answer
SRY Gene Function

The SRY gene on the Y chromosome triggers the development of testes, initiating male physical development.

Term
Testosterone Hormone

Which hormone is responsible for masculinizing the brain and male physical traits?

Answer
Hormone Function

Testosterone.

Term
Oestrogen Influence

How does oestrogen influence gender development?

Answer
Hormone Effects

Oestrogen promotes female genitalia and secondary sexual characteristics and influences feminine-typical behaviours and brain areas related to nurturing.

Term
Oxytocin Role

What is the role of oxytocin in gender development?

Answer
Hormone Influence

Oxytocin affects social bonding, trust, and maternal behaviours, influencing gender-related social interaction patterns.

Term
Animal Studies

How do animal studies support biological explanations of gender?

Answer
Research Evidence

Hormonal manipulation in animals (e.g., testosterone exposure in female rodents) leads to gender-typical behavioural changes.

Term
Brain Structure Differences

Name a brain structure differing between males and females linked to gender development.

Answer
Brain Areas

The hypothalamus.

Term
Limitations

What is a limitation of biological explanations of gender development?

Answer
Critique

They often overlook the influence of environmental and social factors.

Term
Interactionist Perspective

What does the interactionist perspective propose about gender development?

Answer
Theory

Gender development results from the interaction between biological factors and environmental influences such as socialization.

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🧬 Biological Gender Development Quiz

1. What chromosome combination typically results in male biological sex?

Males typically have one X and one Y chromosome, while females have two X chromosomes.

2. The SRY gene is important because it…

The SRY gene on the Y chromosome causes undifferentiated gonads to develop into testes.

3. True or False: Testosterone exposure in prenatal development can increase male-typical behaviours.

Testosterone affects brain development prenatally, leading to masculinized neural circuits and behaviour.

4. Which hormone is involved in social bonding and maternal behaviour?

Oxytocin influences behaviours related to trust and maternal care, contributing to gender differences in social behaviour.

5. One critique of biological explanations of gender development is that they…

Biological models often neglect the role of social and cultural context in shaping gender.

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