New York State Chemistry RegentsNew York State Earth Science Regents

 
Living Environment Regents August 2010 Question 72 PDF Print E-mail
Friday, 27 May 2011 18:29

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Correct answer: (2) the selection of different shaped beaks that best suit different niches

Finches use their beaks for feeding. Thus, the shapes of their beaks depend on the type of food that they eat. Feeding habit is part one the ecological niche of organisms. Niche is the sum total of an organism's utilization of the biotic and abiotic resources of its environment.

Incorrect answers:

(1) asexual reproduction of these finch species

Asexual reproduction is the type of reproduction involving only one parent that produces genetically identical offspring by budding or division of a single cell or the entire organism into two or more parts. Finches do not undergo asexual reproduction. They produce offspring through sexual reproduction.

(3) the genetic recombination associated with mitotic cell division

This statement is incorrect because genetic recombination can only occur during meiosis, a two-stage type of cell division in sexually-producing organism that results in gametes with half the chromosome number of the original cell.

(4) the genetic engineering of the DNA of each of these species

Genetic engineering is not necessary to create finches with different types of beaks.
 

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