explain why you think the dominant trait will or will not replace the recessive trait.

The images above shows an individual with a common thumb variant (recessive trait) and one with brachydactyly type D (dominant trait). The reduced length and increased girth of the distal phalanx in brachydactyly type D has to do with a mutation on HOXD13 (part of the hoxD gene cluster on Chromosome 2) that effects its pattern of development.
Your question: Considering that brachydactyly type D is a dominant trait, will it replace the standard recessive thumb over time?

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