Biology Topic 3 & 4 Keywords 5.0 / 5 based on 5 ratings ? BiologyVoice of the genomeBiodiversity and Natural ResourcesASEdexcel Created by: Lauracashin2599Created on: 02-06-16 18:50 68234157 Across 1. Study of evolutionary history of groups of organisms. Tells us what species are related and how close they are related. (9) 2. Single cell divides twice to produce four cells containing half the original amount of genetic information. These cells are our sex cells (6) 4. Male and female sex cells that join at fertilisation to form a zygote. 23 chromosomes. (6) 5. To transport water and minerals and provide support. Long tube structures formed from dead cells. Hollow lumen and no end walls. Walls thickened with lignin for support- rings. (5, 7) 6. Location of genes on a chromosome (5) 7. Group of similar organisms who can reproduce to give fertile offspring (7) Down 2. From adult body tissue, e.g found in bone marrow (12) 3. Genetic make-up. E.g- Bb (8) 6. Genes with loci on the same chromosome are linked. Stay together during independent assortment. (7) 8. Hydrogen bonds between water molecules and the cell wall (8)
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