AP BIOLOGY

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EVOLUTION

SOURCES OF VARIATION IN A POPULATION

Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
In the 1940s, the scientist J. B. S. Haldane linked many human red blood cell disorders with the tropical regions where malaria occurs. Haldane hypothesized that the widespread presence of these red blood cell disorders as well as traits that protect individuals from malaria were the result of natural selection. Haldane’s hypothesis was later confirmed by the research of A. C. Allison. The resistance to malaria carried by individuals in areas where malaria is widespread is the result of-
A
a vaccine against malaria
B
the individuals’ genetic composition
C
antibiotic medications
D
the individuals’ behavior in avoiding those with the infection
Explanation: 

Detailed explanation-1: -In the 1940s, the scientist J. B. S. Haldane linked many human red blood cell disorders with the tropical regions where malaria occurs. Haldane hypothesized that the widespread presence of the red blood cell disorders as well as traits that protect individuals from malaria were the result of natural selection.

Detailed explanation-2: -Fitness: the ability to survive to reproductive age, find a mate, and produce offspring. Natural Selection: Process by which the best adapted organisms survive and reproduce more often.

Detailed explanation-3: -Genetic Variation is Essential for Evolution by Natural Selection. For natural selection to occur, a population must have a wide variety of individuals with different traits.

Detailed explanation-4: -Adaptations that result from natural selection are expected to increase the fitness of an organism.

Detailed explanation-5: -Why is delayed implantation an advantageous adaptation for the European roe deer? A Delayed implantation allows the mother to continue to breed with other males. B Without delayed implantation, the females would not be able to carry a pregnancy to full term.

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