New York State Chemistry RegentsNew York State Earth Science Regents

 
Living Environment Regents June 2010 Question 10 PDF Print E-mail
Thursday, 26 May 2011 15:31
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Correct Answer: (1) results from isolation of the organism from the rest of the population

Evolution refers to the changes that have transformed life on Earth from its earliest beginnings to the diversity that characterizes it today. There are five possible causes of evolution: natural selection, genetic drift, mutation, gene flow, and nonrandom mating. When an organism is isolated from the rest of the population and is able to reproduce in the new location, natural selection can occur and cause evolution. The species could have evolved due to its adaptation to the new environment.

Incorrect Answers:

(2) is due to a genetic code that is present in the gametes of the organism

Evolution could not occur because the genetic code is still present in the gametes of the organism. Thus, there is no change in species' genome.

(3) decreases the number of gene in the body cells of the organism

Genetic changes such as mutation in the body cells are not carried on to the next generation because they do not give rise to gametes. Thus, a change in the numbers of genes in the body cells could not cause evolution of species.

(4) causes a change in the environment surrounding the organism

A species evolve due to external factors such as reproductive mate, change in environment or location, etc. A characteristic may only change when an external factor drives a change, not the characteristic driving change in the environment and then promoting evolution on itself.
 

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