The Gray Crescent

question 72

Multiple Choice

The gray crescent

• A) is observable in the frog zygote.
• B) develops at the site of sperm entry.
• C) causes rotation of the cortical cytoplasm.
• D) induces formation of the optic cup.
• E) can be mimicked by retinoic acid.

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Definitions:

Credible

A quality of being believable or worthy of trust.

Yield Ratios

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