Carriers of Sickle Cell Are Resistant to Malaria, and Carriers

question 32

Multiple Choice

Carriers of sickle cell are resistant to malaria, and carriers of cystic fibrosis are resistant to cholera. Both are the result of single gene mutations. Why is more than a single trait affected?

• A) Genes for one trait can interact with and influence other traits as well.
• B) Sickle cell and cystic fibrosis are caused by the same alleles.
• C) Most genetic diseases are bad but have good characteristics, too.
• D) Sickle cell disease is known to be related to intestinal diseases.
• E) Malaria is also an infectious intestinal disease.

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Definitions:

NPV

Net Present Value (NPV) is a financial metric that calculates the difference between the present value of cash inflows and outflows over a period of time.

Cost of Capital

The essential return rate an enterprise must attain on projects to uphold its market value and pull in investment.

Present Values

The current value of a future amount of money or stream of cash flows given a specified rate of return.

Net Present Value

A financial metric that calculates the value of projected cash flows, discounted back to the present value.