ANT208H1 Lecture : lec 8 med anthro.docx
Document Summary
Birthing: reproductive health in the modern world. Reproduction and sex are different: making copies versus jumbling genes, sex is not essential for life or reproduction. Parthenogenesis( aphids,rotifers: other ways to share genetic material, eg. bacterial conjugation. Sexual reproduction is costly an hard to explain! Asexual reproduction is twice as efficient avoids infection: you produce offspring that are all female and they can reproduce herself without any imput of any indivudual, replicate yourself twice as fast. Two fold cost of sex ( # progeny +# gene copies: do better more copies. What is the point of males: can not reproduce, just produces sperm, must have other organism to nurture them to become offspring. Sexual reproduction: produces only offspring that is 50% related to 1 parent and. 50% other parent, not 100 % from mother like in asexual. Possible advantages of sharing genes( meiosis and diploidy) Keeping pace with environmental change (not well supported!)
