New York State Chemistry RegentsNew York State Earth Science Regents

 
Living Environment Regents June 2006 Question 71 PDF Print E-mail

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Correct Answer: Option1 selection for favorable variations

This is natural selection. It is a process that causes helpful traits (those that increase the chance of survival and reproduction) to become more common in a population and causes harmful traits to become more rare. This occurs because individuals with advantageous traits are more likely to reproduce, meaning that more individuals in the next generation will inherit these traits. Over many generations, adaptations occur through a combination of successive, small, random changes in traits, and natural selection of the variants best-suited for their environment

If the environmental conditions were the same as that of the ancestor, then there is most like very slight changes from the characteristic of the common ancestor. Thus, option 2 is incorrect.

Option 3 is incorrect. Abnormal mitotic cell division can occur is lifetime of a certain bird however, this cannot be passed on to the next generation because it is just a change of phenotypic characteristic.

Option 4 is incorrect. Changes in characteristics cannot happen in just one lifetime. Evolution occurs gradually through passage of generations depending on the conditions in the environment of the populations.

 

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