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The psychology of gender begins with a foundational conceptual distinction — between sex (a biological category) and gender (a psychological and cultural one) — and quickly raises some of the most contested questions in the discipline about how far our gendered characteristics are biologically fixed and how far they are socially constructed. This lesson sets out the sex/gender distinction, examines sex-role stereotypes, develops the concept of androgyny and Bem's method of measuring it (the Bem Sex Role Inventory), and then turns to atypical sex chromosome patterns — Klinefelter's syndrome and Turner's syndrome — which act as natural experiments illuminating the contribution of chromosomes and hormones to gender development. Throughout, the topic carries unusual social sensitivity, and the material is treated factually and respectfully.
Key Definition: Sex refers to the biological status of being male or female, determined by chromosomes (typically XX or XY), hormones, and reproductive anatomy. Gender refers to the psychological and cultural characteristics associated with being masculine or feminine — including attitudes, behaviours, social roles, and one's internal sense of identity.
This lesson addresses the following points from the AQA A-Level Psychology (7182) specification, Paper 3, Section C: Gender:
| Specification point | Coverage in this lesson |
|---|---|
| The role of chromosomes and hormones in sex and gender (chromosome aspect; hormones treated in the dedicated biological-explanations lesson) | Sex determination; the link from chromosomes to development |
| Sex-role stereotypes | Definition; masculine/feminine content; transmission through socialisation |
| Androgyny and measuring androgyny using the Bem Sex Role Inventory | Bem (1974): the concept of androgyny; construction, scoring, and classification of the BSRI |
| Atypical sex chromosome patterns: Klinefelter's syndrome and Turner's syndrome | Karyotypes, physical and psychological characteristics; what they reveal about nature and nurture |
These points are assessed through short-answer AO1 items, AO2 application where a scenario is provided, and extended-writing essays up to 16 marks. The biological explanation of gender via hormones (testosterone, oestrogen, oxytocin) and the cognitive explanations of gender development (Kohlberg; gender schema theory) are addressed in the dedicated lessons that follow.
The distinction between sex and gender is the conceptual cornerstone of the topic.
| Concept | Nature | Determined principally by | Examples |
|---|---|---|---|
| Sex | Biological, typically assigned at birth | Chromosomes, hormones, internal and external anatomy | XX / XY karyotype; testosterone and oestrogen; reproductive organs |
| Gender | Psychological and social | Culture, socialisation, and cognition, interacting with biology | Masculinity and femininity; gender roles; gender identity |
In most people, sex and gender correspond — biological females typically develop a female gender identity and adopt feminine gender roles. However, the two can diverge, which is one reason psychologists insist on distinguishing them.
Key Definition: Gender identity is a person's internal, subjective sense of their own gender — whether they experience themselves as male, female, both, or neither. It may or may not align with their biological sex.
Key Definition: Gender dysphoria is the recognised condition in which a person experiences a mismatch between their biological sex and their gender identity, which can be a source of significant distress. It is referred to here factually and respectfully as a clinically recognised experience.
Key Definition: Gender roles are the sets of behaviours, attitudes, and personality traits that a particular culture considers appropriate for males or females. Because they vary across cultures and historical periods, gender roles are taken as evidence of the strong social component of gender.
The variability of gender roles across cultures is itself an important piece of evidence for the sex/gender distinction. Cross-cultural anthropology has long noted that the behaviours regarded as "naturally" masculine or feminine differ markedly between societies. Mead's (1935) ethnographic work in Papua New Guinea is the classic example: she reported that gender roles varied substantially between neighbouring groups, with some societies expecting both sexes to be gentle and cooperative and others expecting both to be assertive — patterns that did not map onto the Western expectation of gentle women and assertive men. Although Mead's interpretations were later debated, the broad observation that gender roles are not uniform across cultures supports the view that gender is, at least in part, culturally constructed rather than biologically fixed. If gender roles were determined purely by sex, we would expect them to be the same everywhere; their variation implies a strong contribution from socialisation.
Key Definition: A sex-role stereotype is a set of shared, often oversimplified, beliefs about the behaviours and characteristics regarded as typical of, or appropriate for, males or females within a culture.
Sex-role stereotypes specify the content of what a culture treats as masculine or feminine:
Such stereotypes are transmitted from birth through socialisation — parents, teachers, peers, and the media all communicate expectations about "appropriate" gendered behaviour (for example, through the differential provision of toys, the encouragement of particular activities, and the modelling of gendered behaviour). Stereotypes can become self-fulfilling: a child encouraged towards stereotype-consistent behaviour and discouraged from stereotype-inconsistent behaviour may come to embody the stereotype, which then appears to confirm it. Importantly, stereotypes are descriptive claims about what is typical that frequently shade into prescriptive claims about how people ought to behave — and it is this prescriptive force, restricting the options people feel are open to them, that Bem's work on androgyny set out to challenge.
Key Definition: Androgyny is the possession of both masculine and feminine personality characteristics in roughly balanced measure. An androgynous individual scores highly on both masculinity and femininity, rather than being strongly typed towards one.
Sandra Bem (1974) made a then-radical argument: that rigid sex-typing is psychologically limiting, and that androgynous individuals are better adjusted because they can flexibly deploy whichever characteristics a situation requires — assertiveness in one context, sensitivity in another — rather than being constrained to a single gendered repertoire. Crucially, Bem reconceptualised masculinity and femininity not as opposite ends of one dimension but as two independent dimensions: a person could be high on both (androgynous), high on one and low on the other (sex-typed), or low on both (undifferentiated).
The predicted advantage of androgyny is behavioural flexibility. A sex-typed person, on Bem's account, has a narrower behavioural range and may avoid behaviours coded as belonging to the other gender even when those behaviours would be adaptive — for example, a strongly masculine-typed man might struggle to express vulnerability when a situation calls for emotional openness, while a strongly feminine-typed woman might find it difficult to assert herself when assertiveness is required. The androgynous individual, by contrast, is theorised to be free of these constraints and so better able to respond to the full range of life's demands. It is important to distinguish androgyny, which concerns the content of a person's masculine and feminine characteristics, from gender identity, which concerns a person's internal sense of being male, female, both, or neither: the two are conceptually separate, and a person of any gender identity could in principle be androgynous, sex-typed, or undifferentiated on the BSRI.
To operationalise and measure androgyny, Bem (1974) developed the Bem Sex Role Inventory (BSRI). Its construction was itself systematic: Bem asked judges to rate hundreds of characteristics for how desirable they were "for a man" or "for a woman" in American society, and selected items accordingly. The final inventory comprises 60 attributes:
Respondents rate how well each attribute describes them on a 7-point scale (from "never or almost never true" to "always or almost always true"), yielding separate masculinity and femininity scores. Classification then depends on the combination of the two scores:
| Score pattern | Classification |
|---|---|
| High masculine, low feminine | Masculine (sex-typed) |
| Low masculine, high feminine | Feminine (sex-typed) |
| High masculine, high feminine | Androgynous |
| Low masculine, low feminine | Undifferentiated |
Bem reported that the inventory had high test–retest reliability (scores were stable when the same people were re-tested) and broadly good validity in her original validation work, in which around 1,000 students were classified.
Sex is determined at conception by the 23rd pair of chromosomes. The ovum always carries an X chromosome; the sperm carries either an X or a Y, and so determines the sex of the offspring. An XX combination ordinarily produces a female and an XY combination a male. The decisive factor is the Y chromosome, which carries the sex-determining gene (the SRY gene) that, at around six to eight weeks of prenatal development, triggers the development of testes and the production of male hormones; in its absence, development follows a female pathway. The hormonal consequences of this chromosomal trigger are examined in detail in the dedicated biological-explanations lesson.
Most people have one of the two typical sex-chromosome arrangements — XX (female) or XY (male). A minority have an atypical pattern, in which a sex chromosome is missing or additional. These conditions are valuable to psychologists because they function as natural experiments: by observing how development differs when the chromosomal pattern is atypical, researchers can draw inferences about the contribution of chromosomes (and the hormones they regulate) to gendered development — comparisons that could never be created experimentally for ethical reasons.
Key Definition: Klinefelter's syndrome is an atypical sex-chromosome pattern in which a biological male has an additional X chromosome, giving a karyotype of 47, XXY.
| Feature | Description |
|---|---|
| Karyotype | 47, XXY (one extra X chromosome in a male) |
| Approximate prevalence | In the region of 1 in 600–1,000 male births; many cases are undiagnosed or diagnosed only incidentally |
| Physical characteristics | Reduced body and facial hair, some breast development (gynaecomastia), longer limbs, small and underdeveloped testes, often associated with reduced fertility |
| Psychological / behavioural characteristics | Often reported are quieter, more passive temperaments; some individuals show poorer language and reading development; difficulties with social interaction may be present |
Klinefelter's illustrates that the presence of a Y chromosome typically channels development along a male pathway, but that an additional X is associated with reduced masculinisation of some physical and, in some accounts, psychological characteristics. These descriptions are generalisations: the condition varies considerably between individuals, and many people with Klinefelter's lead unremarkable lives.
Key Definition: Turner's syndrome is an atypical sex-chromosome pattern in which a biological female has only one X chromosome (the second sex chromosome being absent or incomplete), giving a karyotype of 45, X0.
| Feature | Description |
|---|---|
| Karyotype | 45, X0 (a single X chromosome; no second sex chromosome) |
| Approximate prevalence | In the region of 1 in 2,000–2,500 female births |
| Physical characteristics | Short stature, a characteristically "webbed" neck, a broad chest, underdeveloped ovaries (so that puberty and fertility are affected without medical intervention) |
| Psychological / behavioural characteristics | Verbal and reading abilities are often comparatively strong, while visuo-spatial, mathematical, and certain memory tasks may be areas of relative difficulty; some social-adjustment difficulties are reported |
Turner's syndrome shows that a single X is sufficient to direct development along a female pathway, while the absence of the second sex chromosome is associated with a distinctive physical and cognitive profile. As with Klinefelter's, the characteristics are statistical tendencies, not universal features, and are presented here as scientific description.
Taken together, the two conditions support a nuanced conclusion about the role of chromosomes in development. The contrast between a typical karyotype and an atypical one is associated with differences in physical characteristics and, in some accounts, in cognitive and behavioural profiles — which is consistent with the view that sex chromosomes contribute to gendered development. Klinefelter's (an additional X in a male) is associated with reduced masculinisation of certain characteristics, while Turner's (a missing X in a female) is associated with a particular cognitive pattern of relatively strong verbal and weaker visuo-spatial ability. This is precisely the kind of evidence the biological approach draws on to argue that gender has innate foundations. However — and this is the point that must always accompany the description — these correlations between karyotype and characteristics cannot establish that the chromosomes are the direct cause of the psychological differences, for the reasons developed in the evaluation below. The conditions are therefore best read as suggestive natural experiments that inform, rather than settle, the nature–nurture debate about gender.
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