Question

The digital formula for the hind limbs of frog is

• A. $0,2,2,3,3$
• B. $2,2,3,3,3$
• C. $2,2,3,4,3$
• D. $0,2,1,2,3$

Answer 1

Answer: (C)

$2,2,3,4,3$

Digital formula is a way of comparing animals by the number of phalanges that they have in each of their digits. It can be used to study phylogeny or to predict how an animal may use its hands and feet. An animal’s phalangeal formula is simply given as a series of numbers. Most land mammals including humans have a 2-3-3-3-3 formula in both the hands(or paws) and feet. Fore limb of frog is 0-2-2-3-3 and hind limb is 2-2-3-4-3.

So, the correct answer is ‘2-2-3-4-3’.