HLTB20H3 Lecture 7: HLTB20 Lecture 7
Document Summary
Assortative mating: in many cultures, there is a preference for lighter skin colours; gene culture co-evolution. Establish a link between pigmentation to a cultural bias which, through sexual selection, modifies the distribution of phenotypes genotypes. Women darken during pregnancy and while taking contraceptive pills. Linkage between (relative) light pigmentation and fecundability in women. Lighter skin was advantageous for females to attract males, why: lighter skin evolved with neotenous traits- sexual attractant, melanin production is controlled by the anterior pituitary, which also secretes the gonadotropins- signalling fecundability among women. Hypotheses for further study: lighter skin in women is more apparent in: less stratified societies, monogamous stratified societies. Lecture 7 continued hemoglobin, sickle cell and malaria. Carry oxygen from the lungs absorb oxygen via tiny alveoli in the lungs delivered via arteries and capillaries to organs, tissues and the muscles of the body.
