of chromosome 21, these three copies leads to mental retardation, developmental and behavioural abnormalities. This proves that genes do have an effect on a person¡s characteristic as almost all behaviour is influence by genes, but no behaviour is solely determined by genes.
             Gender is considered to be socially constructed/socially acquired as apposed to sex which is biologically given. Gender is the category which people identify them as and is the individual¡s subjective sense of belonging to male or female or neither of the two. Sociobiologist have argued that behaviour differences derive from their biology (men in most cultures hunt and are involved in warfare, women are considered to be the less aggressive). These differences between men and women are fairly small compared to the similarities between them in terms of body plan, anatomy and function. These are even less marked in early childhood and later years, when hormone levels are small. Even when sex hormones are at higher levels, 'maleness¡ and 'femaleness¡ cannot be established from the hormone count alone (Oakley, 1985) some of the characteristics which are seen as biologically fixed (sexual drive or maternal instinct) could instead be seen as a product of social conditioning. For example the word 'sex¡, used in the sense of meaning sexuality
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