genetics crossword glossary

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Across
  1. 3. Occurring, growing, or existing before the customary, correct, or assigned time
  2. 6. A thin, tough, membranous sac that encloses the embryo or fetus of a mammal, bird, or reptile. It is filled with a serous fluid in which the embryo is suspended.
  3. 7. Within or administered into a vein.
  4. 9. The replacement of stale or noxious air with fresh air.
Down
  1. 1. The period of development in the uterus from conception until birth; pregnancy.
  2. 2. Membranous tissue composed of one or more layers of cells separated by very little intercellular substance and forming the covering of most internal and external surfaces of the body and its organs.
  3. 4. Of long duration; continuing
  4. 5. A physician who specializes in obstetrics.
  5. 8. Develop or be the first to use or apply