By Patricia Weerakoon When we biologists say that sex in humans is binary, and there are two sexes, male and female, we are not talking about sexual intercourse, chromosomes, body types (body shape, breasts), behaviour (masculine or feminine) or personal identity (the so-called inner feeling that you are male or female). When biologists say that sex in humans is binary, we are making a statement about the number of distinct reproductive strategies the human species is capable of. The term ‘reproductive strategy’ is a biological concept. It’s not something unique to humans. It simply means the system for propagating genes and forming a new individual organism. Different kinds of plants and animals have different reproductive strategies. For example, some plants reproduce asexually, through budding or fragmentation. The new plants are genetically identical to the parent, because no new DNA has been introduced. Humans possess a binary reproductive strategy. I mentioned i...
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