Which of the following statements about heterochrony is true?
A) The gene BMP4 is expressed in both embryonic chickens and ducks.
B) The gene Gremlin is expressed in both embryonic chickens and ducks.
C) Gremlin protein activates a BMP inhibitor in both embryonic chickens and ducks.
D) Apoptosis of cells between the toes takes place in ducks but not chickens.
E) Both a and c

Question

Quizplus · Accepted Answer

Heterochrony refers to evolutionary changes in the timing or rate of development. Both choice A and C mention the gene BMP4, which is involved in limb development, and Gremlin, which is a BMP inhibitor. Therefore, both A and C are related to heterochrony. However, only choice E includes both A and C, making it the correct answer. Choice D may be related to heterochrony, but it only applies to ducks and not both ducks and chickens, so it is not the best choice here.

Which of the Following Statements About Heterochrony Is True