The Snakes Include Some Rather Short and Some Incredibly Long

question 40

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

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