When a population reaches fixation, which of the following is true?
A) Disequilibrium has occurred.
B) It has lost one of the two alleles that code for a character.
C) The mean value of a correlated character has changed.
D) Mutation has added new variation to the population.

Question

Quizplus · Accepted Answer

Fixation occurs when all individuals in a population become homozygous for one allele, resulting in the loss of the other allele. Therefore, option B is the correct answer. Option A is incorrect because fixation is a state of equilibrium. Option C is incorrect because fixation does not necessarily result in a change in mean value of a correlated character. Option D is also incorrect because mutation is the source of new variation, but fixation means that one allele has become fixed and the other has been lost.

When a Population Reaches Fixation, Which of the Following Is