New York State Chemistry RegentsNew York State Earth Science Regents

Living Environment Regents June 2010 Question 55 PDF Print E-mail
Thursday, 26 May 2011 17:13

Type of gamete: ZW

In birds and some fishes, the variable that determines sex is the sex chromosome present in the ovum, not in the sperm. The males are ZZ and females are ZW. The female gamete ZW determines the sex of the offspring because it is composed of two different types of chromosomes.

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