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Egg cells are found in the ovaries of a woman. They are released during ovulation and can be fertilized by sperm to potentially form a zygote and develop into an embryo.
Marsupial embryos do not have an amnion. Instead, they develop within a pouch called a marsupium on the mother's abdomen.
Fertilization is the process where a sperm cell fuses with an egg cell to form a zygote. This zygote then starts to divide and develop into an embryo. If fertilization is successful, the embryo implants itself into the uterus where it continues to grow and develop into a fetus.
Yes, an embryo can develop with one X chromosome, rather than the XX or XY chromosome pair. An example of this is girls born with Turner's syndrome, who have only one X chromosome.
Women typically have two embryos when they are pregnant with twins. However, during a normal pregnancy, a woman has one embryo which develops into a fetus.