Which of the following is true of a population that is evolving by means of natural selection

Evolution is the change in a population through genetic variation over time. Natural selection may be through (1) differential reproduction, that is, not all organisms are able to reproduce to their fullest capacity because nature cannot simply sustain it and (2) acquire genes, that is heredity.

1. B. Organisms best adapted to their environment have the highest fitness.

2. D. Aa & aa.

3. A. Populations within a species must be reproductively isolated.

4.A. An adaptation increases the fitness of the individual.

5. C. The point at which two groups shared a common ancestor.

6.D. All living things share a universal code.

7. A. The principle of common descent is the idea that all living & extinct organisms shared a common ancestor at some point in their evolutionary history.

8. D. The allele for white fur would probably increase as natural selection works on the population.

9. B. The bottleneck effect.

10.C. Adaptive radiation & convergent evolution.

the correct answer is: b. pantala flavescens, because these organisms would have a high level of genetic variation due to sexual reproduction.  

because involves two organisms (parents) whose genetic material combines, sexual reproduction leads to genetic variation in new generations of offspring. the offspring is an unique organism, with new genome, more protected with the higher ability to adapted. this process is fundamental to evolution.