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Transcript
The mammalian circulatory system upper limbs and head lungs pulmonary artery pulmonary vein aorta heart liver digestive system kidneys rest of body Key Stage 3 National Strategy Science Slide 3.12 Blood cells white blood cell red blood blood red cell cell plasma platelet Key Stage 3 National Strategy Science Slide 3.14 Diagram of cross-section of a leaf wax cuticle upper epidermis palisade mesophyll air space mesophyll lower epidermis chloroplast spongy mesophyll stoma guard cell Key Stage 3 National Strategy Science wax cuticle Slide 4.21 Sex cell division Parent cell with 4 chromosomes. nuclear membrane Chromosomes replicate forming pairs of chromatids. Pairs of chromosomes arrange themselves in the centre of the cell. The chromosomes separate and move to opposite ends of the cell. The first cell division occurs. The chromosomes now separate from each other and move to opposite ends of the cells. The second cell division occurs. Key Stage 3 National Strategy Science Slide 4.29 Determining sex in humans Male parent provides sperm with either an X or Y chromosome. Female parent provides eggs with an X chromosome. The possible combinations in the offspring are: Male parent X Y X XX XY X XX XY Female parent Key Stage 3 National Strategy Science Slide 4.31
