Vocabulary 2.4

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Across
  1. 1. reproductive cell of plant or animal
  2. 8. hollow sphere cells produced during embryo development by repeated cleavage of a fertilized egg.
  3. 9. the outermost fetal membrane around the embryo in mammals, birds and reptiles’
  4. 10. a small membranous structure outside the embryo with various functions during embryonic development
  5. 11. a series of mitotic divisions where the enormous volume of egg cytoplasm is divided into nucleated cells.
  6. 12. process in which an embryo transforms from one layer of epithelial cells, a blastula, and reorganizes into multiple layers.
  7. 15. sperm and egg fuse to form diploid zygote
  8. 16. a cluster of dividing cells made by a fertilized egg
  9. 17. cells forming the outer layer of a blastocyst, which provides nutrients to the embryo, and develops into a large part of the placenta
  10. 19. a type of cell division in sexually reproducing organisms that reduces the number of chromosomes in gametes
  11. 20. the outermost of the three primary germ layers of an embryo
  12. 21. process in which the female gametes, or ova are created
Down
  1. 2. consist of the chorion , amnion, yolk sac, and allantois
  2. 3. fertilized egg cells that result from the unions of a female gamete with a male gamete
  3. 4. process of producing sperm cells
  4. 5. an organ that connects the developing fetus to the uterine wall
  5. 6. an extra-embryonic membrane of reptiles, birds, and mammals arising as a pouch, or sac, from the hindgut
  6. 7. the innermost of the three basic layers of an embryo that forms the epithelium of the digestive tract
  7. 12. early multicellular embryo with two or more germinal layers of cells
  8. 13. a membrane that closely covers the human and various other embryos when first formed
  9. 14. the middle of the three primary germ layers of an embryo
  10. 18. the production of gametes from haploid precursor cells