Question

13 Humans impose changes in organisms through selective breeding in artificial selection, whereas, in natural selection, natural forces such as competition and climate impose changes. (Circle the correct answer.) True / False 14 Differentiate between microevolution and macroevolution. 15 Which statements differentiate microevolution and macroevolution? (Circle the correct answer.) a. Microevolution is evolution occurring at the species level within populations. b. Macroevolution is evolution above the level of species. C. Macroevolution occurs over long periods of time. d. Both a and b. e. All of the above.

Answer 1

Answer 13:

Natural selection is the selection of a particular trait or species by natural forces, for example climate, resources, natural extremities (flood, drought) , etc. On the other hand, artificial selection is the selection of specific traits of interest by humans via selective breeding. For example, breeding of a specific cow for higher milk yield.

Hence, the given statement is true.

True

Answer 14:

Microevolution refers to the processess of evolution that takes place at the smallest level, i.e. in genes (sequences of bases in genetic material). This involves mutations, gene flow, recombination and natural selection. Microevolution concerns an individual within a given population. This takes place in a shorter period of time compared to macroevolution.

Macroevolution on the other hand, refers to the processess of evolution at the largest scale, i. e. evolution at and beyond species level. It involves events such as extinction, or speciation of species. Macroevolution takes longer time period comparatively to take place.

Answer 15:

Following the information from answer above, we can say that all the given statements are true. The correct choice should be:

15 Which statements differentiate microevolution and macroevolution? (Circle the correct answer.) a. Microevolution is evolution occurring at the species level within populations. b. Macroevolution is evolution above the level of species. c. Macroevolution occurs over long periods of time. d. Both a and b. e. All of the above.

(e) All of the above