The Essentials of GCSE OCR Science for Specification B
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 ac differences between individual gametes (eggs and sperm) ac 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 |
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