Question

The afrikaner population of dutch settlers in south africa is descended mainly from a few colonists. today, the afrikaner population has an unusually high frequency of the gene that causes huntington's disease. huntington's disease is an autosomal dominant disease and only one allele is needed for the disease (hh, hh). the afrikaners are an example of a founder effect. it is also an example of genetic drift. how is the founder effect related to the concept of genetic drift?
a.reduced genetic variation of this small population means that the population may not be able to adapt to new selection pressures.
b.in a small population, the more advantageous trait becomes more common. if this continues, eventually, all individuals in the population will have huntington's disease.
c.the small population size means that the new colony may have reduced genetic variation from the original population and that variation, in this case, included the dominant allele for huntington's disease.
d.there are three sources of genetic variation: gene flow, sexual reproduction and mutation. in the case of the afrikaners, once the settlers arrived in africa, these three sources had little impact on the gene pool and variation.

Answer 1

The answer is D. Founders effect happens when a couple of people wind up disengaged from a bigger populace and set up another populace whose quality pool isn't illustrative of the first populace. An author impact happens when another state is begun by a couple of individuals from the first populace. 

Answer 2

Answer:

The most appropriate answer would be option c.

The genetic drift is one of the reasons for the evolution during which the gene frequency of the population gets changed. Most of the time, the genetic variability gets lost as the population size decreases to a very small size.

The founder effect is a type of genetic drift by which the genetic variation of a population is reduced as the population is derived from small colonized ancestors.

Similarly, the founder effect is observed in the Afrikaner population as they are derived from a few colonists.

Thus, they have reduced genetic variation as compared to the original population.

In addition, the entire population has the dominant allele of Huntington's disease due to decreased genetic variation.