Lesson 25: Embryology Week 1 Quiz

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  1. 1. The development that happens in the first week is essentially the same in any type of animal.

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  2. 2. What do gap junctions do?

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  3. 3. The protective layer around the first-week developing cells is called the:

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  4. 4. Which stage of development to scientist target for harvesting? (This would apply to experiments using mice, rats, and even sea urchins.)

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  5. 5. The “inner cell mass” will grow to become the embyro (baby) and the cells in the outer ring will become the placenta and the outer sac.

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  6. 6. During the first week of development the number of cells increases but the overall size stays the same.

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  7. 7. Where does the first week of development occur?

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  8. 8. Blastula and blastocyst mean the same thing.

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  9. 9. Totipotent means that the cell’s DNA is completely open, so that any part of it can be read and copied.

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  10. 10. “Morula” comes from the Greek word “morus” which means:

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  11. 11. What is an ectopic pregnancy?

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  12. 12. The cells in a newborn baby’s body are still pluripotent.

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  13. 13. It takes an entire day for the zygote to go through its first mitosis.

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  14. 14. Human and mammal eggs do not go through an hatching process, only bird and reptile eggs do this.

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  15. 15. Which is totipotent?

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