Answered: , within specific regional populations…

Human Biology (MindTap Course List)

11th Edition

ISBN:9781305112100

Author:Cecie Starr, Beverly McMillan

Publisher:Cecie Starr, Beverly McMillan

Chapter20: Chromosomes And Human Genetics

Section: Chapter Questions

Problem 6CT: About 4 percent of people of Northern European descent have a cystic fibrosis allele, but only about...

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Question

If, within specific regional populations over two thousand years ago, sickle-cell anemia killed those individuals born with it before they could reproduce to pass it on to offspring, how did it persist in these populations?

Group of answer choices

A-Because of late-onset of the disease.

B-Because it is cause by a virus and it spreads faster than people died.

C-Because of the basic principles of mendelian inheritance that result in some heterozygote "carrier" combinations.

D-Because malaria made it possible to survive sickle cell anemia since the parasite would carry oxygen on the blood cells with the mutated hemoglobin.

E-It does not persist. Natural selection removes the allele because people die from both malaria and sickle-cell anemia.

Definition Definition Organism that lives in the body of another organism and obtains food at the expense of the host. A parasite can directly or indirect harm the host. There are two kinds of parasites: internal and external. An internal parasite lives inside another organism and is known as an endoparasite. An external parasite lives on the body surface of the host and is known as an ectoparasite. Protozoa and helminths are examples of major human parasites.

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