7. In the types of natural selection graphs, what type of selection is occurring

Question

7. In the types of natural selection graphs, what type of selection is occurring in a population if the distribution graph shifts from the left end of the spectrum to the far right end? A. directional B. stabilizing C. disruptive D. Populations do not undergo selection, they are fixed. 8. The was proposed to help explain speciation that appears in the fossil record. A. evolutionary species concept B. morphological species concept C. phylogenetic species concept D. genetic divergence species concept 9. In which model of evolution are many transitional forms predicted? A. punctuated equilibrium B. gradualistic C. Neither punctuated equilibrium or gradualistic D. Both punctuated equilibrium and gradualistic. 10.. The biological species concept relies mainly on to define a species. A. reproductive isolation B. morphological differences C. the presence of analogous traits D. comparative biochemical analysis 11. Reproductive isolation A. means there is no gene flow between two groups of organisms (species). B. is necessary for species to remain separate. C. is maintained by certain prezygotic and postzygotic barriers. D. All of the choices are correct. E. None of the choices are correct. 12. Isolating mechanisms that prevent reproductive attempts or make it unlikely that reproductive attempts will be successful are referred to as A. prezygotic reproductive isolating mechanisms. B. a lack of F2 fitness. C. postzygotic isolating mechanisms. D. Two of these are correct. E. None of the answer choices are correct. 13.What type of speciation requires a geographic barrier? A. sympatric speciation B. allopatric speciation C. both sympatric and allopatric speciation require a geographic barrier D. neither sympatric or allopatric speciation require a geographic barrier

Explanation / Answer

7. In the types of natural selection graphs,what type of selection is occuring in a population if the distribution graph shifts from the left end of the spectrum to the far right end?

A. directional.

B. stablising.

C. disruptive.

D. populations donot undergo selection, they are fixed.

Ans: Directional.

It is a type of Natural Selection in which one of the extreme phenotypes has highest fitness.

8. The -------------- was preposed to help explain speciation that appears in the fossil record.

A. Evolutionary species concept.

B. Morphological species concept.

C. Phylogenetic species concept.

D. Genetic divergence species conept.

Ans: Evolutionary species concept.

It relies on observable morphological traits to distinguish one species from another. It also requires the species sharing the same evolutionary pathway. In this pathway the changes in traits show the evolution of new species in the fossil record.

9. In which model of evolution are many transitional forms predicted.

A. Punctuated equilibrium.

B. gradualistic.

C. Neither punctuated equilibrium nor gradualistic

D. Both punctuated equilibrium and gradualistic.

Ans: gradualistic.

According to this model changes are the cumulative product of slow but continous processes.

10. The biological species concept mainly relies on---------to define a species.

A. reproductive isolation.

B. morphological differences.

C. the presence of analogous traits.

D. comparative biochemical analysis.

Ans: Reproductive isoation.

This concept defines Species as potentially interbreeding members of a population.

11. Reproductive isolation

A. means there is no gene flow between two groups of organisms(Species).

B. is necessary for Species to remain separate.

C. is maintained by certain prezygotic and postzygotic barriers.

D. All of the choices are correct.

E. None of the choices are correct.

Ans: All of the choices are correct.

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