Question

A loss of 90% of the population in the Pingelap atoll from a typhoon in 1775 resulted in a high percentage of the current population being affected by achromatopsia. As a result, all of these affected individuals _____.

a. have normal vision

b. are descendants of one of the 20 original survivors

c. receive genetic testing and genetic counseling

d. have exceptional hearing

e. are descendants of the 20 original survivors

Answer 1

Option-B

Step-by-step explanation:

Pingelap is an atoll consisting of three islands: Daekae, Sukoru and Pingelap Island.

The present population of the atoll is 250 residents, the proportion of which has the color blindness called achromatopsia caused by the loss of the cone cells which respond to a different wavelength of light.

The achromatopsia on the atoll can be traced back in 1775 when a catastrophic typhoon swept the island and left only 20 individuals. One of these individuals named the Doahkaesa Mwanenihsed was the carrier of the disease and the inbreeding in the descendants of this individual resulted in the increase in the frequency of the recessive allele and is the cause of the affected individuals.

Thus, Option-B is the correct answer.