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Across 2. A hormone measured in the blood to determine pregnancy 8. a process where the cell divides through cell division 12. Hormone that acts to prepare the uterus for implantation of the fertilized ovum/ maintain pregnancy 15. an early form in the development of an embryo/ sphere shaped embryo that is filled with fluid and cells 16. A membranous sac attached to an embryo that provides early nourishment in the form of yolk

Down 1. A cell produced from the union of 2 gametes, mainly from the fertilized ovum before cleavage 3. This happens after mitosis where there is a repeated division of the cell into daughter cells 4. A membrane that lines the uterus/ where fertilized eggs are implanted. 5. The outer membrane that surrounds the embryo 6. A yellow mass of cells that forms from an ovarian follicle during the luteal phase of the menstrual cycle in mammals; it secretes steroid hormones 7. A thin, tough, membranous sac which surrounds the embryo and fetus 9. attachment of the fertilized egg/ blastocycst to the wall of the uterus at the start of pregnancy 10. The membrane that forms the wall of a blastocyst during early pregnancy 11. Hormones that are produced by the ovaries/ responsible for promoting the development/ maintaining female sex characteristics 13. A membranous sac that forms from the posterior part of the alimentary canal in our embryos 14. 16 sphere like cells that form into a solid ball