Check your understanding of concepts from 25·12–25·15 Human development occurs in specific stages, and 25·16 Reproductive technology has benefits and dangers by answering the following questions.
1. The three embryonic germ layers formed during gastrulation are ectoderm, endoderm, and ______________:
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2. Which of the following events would lead to male development when a sperm meets with a normal egg?
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3. Infertility of two prospective parents is defined as:
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4. In humans, fetal growth is slowest during which trimester?
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5. The gradual dilation of the human cervix occurs during:
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