ZackaryF

02.12.2020 • 

Biology

In parts of equatorial Africa, where the malaria parasite is most common, the sickle-cell allele constitutes 20% of the β-hemoglobin alleles in the human gene pool. The sickle cell trait provides an advantage against malaria compared to people with normal hemoglobin. In the United States, the parasite that causes malaria is not present, but African Americans whose ancestors were from equatorial Africa have the sickle-cell β-hemoglobin allele. These differences in traits illustrate a. inclusive fitness because people have evolved molecular differences to adapt to environmental stimuli
b. inclusive fitness because β-hemoglobin increases the proliferation of beneficial traits in the population
c. relative fitness because people have evolved molecular differences to an environmental pathogen
d. relative fitness because the molecular differences in β-hemoglobin are passed to the next generation

Ответ:

chris858232

28.12.2021

Biology

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  see the attachment

Step-by-step explanation:

It helps to follow along the proof and consider how you get from here to there.

In the 5th line, we have a sum in symbols.

In the 7th line, we have an expression with a number on the right side, and a statement that says we got there by subtraction.

Then we expect line 6 to have a sum with numbers whose difference is 40°. (That eliminates the 3rd and 4th choices.)

The way you get from an expression with symbols to an expression with numbers is to make a substitution of numbers for symbols. Hence the appropriate choice is the one shown below.

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