Microevolutions occur when ________.
A) a bird has a beak of a particular size that does not grow larger during a drought
B) changes in allele frequencies in a population occur over generations
C) gene flow evenly transfers alleles between populations
D) individuals within all species vary in their phenotypic traits

Question

Quizplus · Accepted Answer

Microevolutions refer to changes in the genetic makeup of a population over time. These changes are reflected in the frequency of alleles, which are different versions of a gene. Therefore, option B is correct. Option A refers to an individual trait that does not involve changes in allele frequency, so it is not an example of microevolution. Option C is not always true since gene flow may not transfer alleles evenly between populations. Option D refers to genetic variation within a species but does not necessarily involve changes in allele frequency over time.

Microevolutions Occur When ________