Ducks Have Webbed Feet and Chickens Do Not Because

question 20

Multiple Choice

Ducks have webbed feet and chickens do not because

• A) ducks need webbed feet to swim, whereas terrestrial chickens do not.
• B) both duck and chicken embryos express BMP4 in the webbing between the toes, but the Gremlin gene is expressed in the webbing cells only in ducks.
• C) both duck and chicken embryos express BMP4 in the webbing between the toes, but the Gremlin gene is expressed in the webbing cells only in chickens.
• D) only duck embryos express BMP4 in the webbing between the toes.
• E) only chicken embryos express BMP4 in the webbing between the toes.

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Definitions:

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