MCAT Biology Question 43: Answer and Explanation
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Question: 43
13. Which of the following shows the correct order of early developmental milestones during embryogenesis?
- A. Blastula → gastrula → morula
- B. Morula → gastrula → blastula
- C. Morula → blastula → gastrula
- D. Gastrula → blastula → morula
Correct Answer: C
Explanation:
After the first cell divisions occur, the embryo consists of a solid ball of cells known as a morula. Then a hollow center forms, creating the blastula. Finally, as the cells begin to differentiate into the three germ layers, the embryo is considered a gastrula. Choice (C) is therefore the correct answer.