human behaviour is driven by need to survive and reproduce, genes that give reproductive advantage will increase gene pool
intersexual selection
often females due to high investment cost and parental certainty of children, pick highest quality mate from wide selection according to attractive features indicating good genes
intra sexual selection
males due to low investment costs and lack of parental certainty, competing between each other for access to large quantity of members of other sex
intersexual selection
females choose to prevent wasting invested time and energy on offspring which are of poor genetic quality, females have a gene which makes them find the male characteristic appealing
intra sexual selection
males compete against each other to appear to be the best mate and winners get to pass on these genetic characteristics to their off-spring, and so it continues
sexual dimorphism
differences in appearance between males and females of same species, such as colour, shape, size and structure
females look for qualities that would help raise a child to adulthood, resources, money, physical characteristics linked to dominance (tall and healthy), v shaped chest
males look for qualities of fertility that indicate production of healthy offspring, large breasts, young (facial features), body shape of 0.7 waist to hip ratio, indicates sexual maturity but no pregnant
anisogamy
refers to fact that male gametes (sperm) produced in large numbers with little cost, compared to production of female gametes (eggs)
