[Campbell Biology P.332] Based on the data provided for the cross between two AaBbCc individ... | Practice Question

Based on the data provided for the cross between two AaBbCc individuals, what pattern of distribution does the offspring's skin color phenotype show?

  • A: A normal distribution (bell curve).
  • B: A skewed distribution.
  • C: A bimodal distribution.
  • D: A uniform distribution.

Explanation

The exercise asks to sketch a curve of the distribution. The frequencies 1, 6, 15, 20, 15, 6, 1 are symmetrical around the central peak value 3 dark-skin alleles with a frequency of 20/64 . This symmetrical, bell-shaped pattern is characteristic of a normal distribution, which is common for polygenic traits.