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advantage allele Amazon molly animals antigens asexual reproduction attractive average bacteria become behaviour benefits better biological biologists birds body breeding called cells cent centriole centromere chance chimpanzee chromosomes clone competition copies copulation cultures daughters diploid eggs ensure environment enzymes equal numbers eukaryotes evolution evolutionary evolved example extra father favour female's fertilized gametes gender genes genetic material gorilla haploid histocompatibility antigens homosexuality host human females incest individuals investment live look male and female male's mammals marriage mating system meiosis mitosis molecule monogamous mother Muller's ratchet mutation natural selection nest offspring organisms orgasm ovulation pair parasites parental parthenogenetic partner pattern penis perhaps philanderers plants polyandry polygyny population predators probably produce prokaryotes proteins reason recombination result seems sex ratio sexual reproduction sexual species simply sperm spirochaete stag strategy success survive tail territory thing turtle variety woman women young