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Why are egg and sperm cells specialised? Assisted reproduction and birth control". Fungal Genetics and Biology. For one thing, the egg has to be larger than the sperm cell so itcan accommodate the sperm cell when it penetrates the egg. Sperm and egg cells are? The cells also have an active metabolism as substances are absorbed and released.
The egg cellor ovum plural ovais the female reproductive cell gamete in oogamous organisms. The egg egg cells and sperm cells is typically not capable of active movement, and it is much larger visible to the naked eye than the motile sperm cells. When egg and sperm fuse, a diploid cell the zygote is formed, which rapidly grows into a new organism. Karl Ernst von Baer discovered the mammalian ovum inand Edgar Allen discovered the egg cells and sperm cells ovum in The fusion of spermatozoa with ova of a starfish was observed by Oskar Hertwig in In vertebrates, ova are produced by female gonads sexual glands called ovaries.