In comparing the development of the unwebbed foot of the chicken and webbed foot of a duck,what differences are there in the expression of
BMP4 and gremiln?
A)Chicken feet only express BMP4 while duck feet only express gremiln.
B)BMP4 is expressed similarly in both chicken and duck feet,while gremlin is only expressed in duck feet.
C)Gremlin is expressed similarly in both chicken and duck feet,while BMP4 is only expressed in between chicken digits.
D)Both BMP4 and gremlin are expressed similarly in chicken and duck feet.
E)BMP4 is expressed similarly in both chicken and duck feet,while gremlin is not expressed between the digits of chicken feet.

Question

Quizplus · Accepted Answer

BMP4 is expressed in the developing limbs of both chickens and ducks to promote the formation of digits. However, the difference in webbing is due to the expression of gremlin, which inhibits BMP4 activity. In ducks, gremlin is expressed between the digits, allowing webbing to form by preventing the apoptosis (cell death) that would normally separate the digits, as seen in chickens where gremlin is not expressed between the digits.

In Comparing the Development of the Unwebbed Foot of the Chicken