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.

Question

Quizplus · Accepted Answer

The Answer of 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.

Ducks Have Webbed Feet and Chickens Do Not Because