The Essentials of GCSE OCR Science for Specification B

The Essentials of GCSE OCR Science for Specification B

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A revision guide covering the core content of the OCR Science B (single award) specification from the Gateway Science suite.mutations which alter the genes a€c differences between individual gametes (eggs and sperm) a€c random fusion of an egg with one out of millions of sperm at fertilisation. ... Gender (in mammals) is inherited via the sex chromosomes; one of the 23 pairs present in humans. The chromosomes are labelled X or Y. It is the presence of the Y chromosome which determines the gender of an individual: XX = female; XY = male. d) All egg cells carry X chromosomes. Half the sperm carry Xanbsp;...


Title:The Essentials of GCSE OCR Science for Specification B
Author: Jacquie Punter, Robert Johnson, Steve Langfield
Publisher:Letts and Lonsdale - 2006
ISBN-13:

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