B1 topic 1 - revision 4.0 / 5 based on 2 ratings ? AccountingGCSEEdexcel Created by: Ellis EvansCreated on: 15-04-13 12:01 10953812764 Across 1. The development of a species over time because of natural selection (9) 4. Eats other organims (tissues) (13) 5. Lots of cells (13) 6. Makes its own energy (photosynthisis) (11) Down 2. A change in the characteristic in alleles (9) 3. Structure and protection (4, 4) 7. Contains DNA, controls cellular activities (7) 8. Fromation of new species, such as when populations of a species are seperated geographically and evolve until they are no longer capable of interbreeding (10) 9. A supporting rod running down the length of the body. Note: doesn't have to be bone! (8) 10. If both alleles for a charactistic are the sam, the organism is homozygous for that characteristic (10)
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