Sexual and asexual reproduction, chromosomes, genes and monohybrid inheritance, variation and natural selection, and food chains and the carbon cycle.
Reproduction
Asexual — one parent, no gametes, offspring genetically identical (clones).
Sexual — two parents, gametes fuse at fertilisation, offspring show variation.
In humans, sperm (from the testes) fertilise an egg (from the ovary) in the oviduct, forming a zygote that implants in the uterus. The placenta exchanges oxygen and glucose in, CO₂ and urea out.
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