Pikas are small mammals that live at high elevation in the talus slopes of mountains. Most populations located on mountain tops in Colorado and Montana in North America are isolated from one another because pikas don't occupy the low-elevation habitats that separate the mountain tops and don't venture far from the talus slopes. Thus, there is little gene flow between populations. Furthermore, each population is small in size and was founded by a small number of pikas. A group of population geneticists propose to study the amount of genetic variation in a series of pika populations and to compare the allele frequencies in different populations. On the basis of the biology and distribution of pikas, predict what the population geneticists will find concerning the within- and between-population genetic variation.

It is expected to observe a low genetic variation within populations and high genetic variation between populations.

Explanation:

The pika's populations are geographically isolated among them, it drastically will increase the genetic variation among populations, especially due to the random process of genetic drift (and also to mutations). On the other hand, this geographical isolation also contributes to decreasing the genetic variation within populations due to the endogamy among their members. The combination of both genetic features (i.e., a low genetic variation within populations and high genetic variation between populations) are expected to produce high genetic diversity effects and a low population structure.

some inherited genetic mutations can be good for the offspring, so the answer is different genetic mutations cause many forms of cancer.