Different species of the Australian lizard genus Hemiergis have different numbers of digits.
Developmentally, what is the most likely cause of this variation in digit number?

Question

Different species of the Australian lizard genus  Hemiergis  have different numbers of digits. 
Developmentally, what is the most likely cause of this variation in digit number?

Answer

A gain-of-function mutation in the  Fgf8  gene promoter

Answer

Varied expression of  Fgf8  in the limb bud mesenchyme

Answer

Loss-of-function mutations in  Sonic Hedgehog

Answer

Variation in  Sonic Hedgehog  expression

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Different species of the Australian lizard genus Hemiergis have different numb...

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