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Apoptosis in the developing hand is responsible for

  • A.the growth of the finger bones
  • B.the formation of the nails
  • C.the sensitivity of the fingertips
  • D.the separation of the fingers

Answer: D

Correct answer: the separation of the fingers

The hand forms first as a paddle, and the digits are freed by the death of the cells in the webs between them. It is the standard illustration that apoptosis is a sculpting process rather than a response to damage - and when it fails the fingers remain joined, which is the developmental basis of syndactyly.

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