Multiple Choice
The snakes include some rather short and some incredibly long species,with a variation from about 100 to over 300 vertebrae.What developmental mechanism is the best candidate for changing the number of vertebrae in evolution?
A) Changes in genes that lay down extracellular matrix in bone
B) Changes in genes necessary for neural crest development
C) Changes in genes that control mitosis
D) Changes in the somitogenesis clock
Correct Answer:

Verified
Correct Answer:
Verified
Q35: What would result if too many cells
Q36: Choose the letter of the best match
Q37: What is the main role of human
Q38: Referring to the figure of sperm penetration
Q39: A couple conceives a child on January
Q41: What are the two components of the
Q42: In 1999,researchers found that they could create
Q43: What is the term for segmented blocks
Q44: In this diagram,which of the following numbers
Q45: Which of the following activates the egg?<br>A)entrance