New York State Chemistry RegentsNew York State Earth Science Regents

Living Environment Regents June 2010 Question 15 PDF Print E-mail
Monday, 30 May 2011 10:34

Correct answer: (1) zygote contains a complete set of genetic information

The arrow represents the process called fertilization wherein the female gamete (egg cell) and the male gamete (sperm) unite to a zygote, a fertilized egg. Each gamete contributes half of the genetic information, thus, the resulting zygote is diploid, with complete set chromosomes which contains the genetic information.

Incorrect answers:
(2) gametes contain a complete set of genetic information

The resulting zygote after fertilization of male and female gametes is not merely a gamete. A gamete is only haploid, containing only half of the genetic information. The zygote contains a complete set of chromosomes, and will eventually undergo various cell division and differentiation to form a fully-developed organism.

(3) zygote contains half of the genetic information

Zygote is a diploid product of the union of haploid gametes in conception or fertilization. Only the gametes (first and second structures in the illustration on the left side) each contain half of the genetic information.

(4) gametes contain half of the genetic information

While this statement is true that gametes contain half of the genetic information because they are only haploid, it is not true that the result of the process is a gamete. The result of fertilization (arrow) is a zygote, which is diploid, meaning it contains two sets of chromosome, one coming from the female, and another from the male gamete.
Last Updated on Monday, 30 May 2011 10:36

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