B1 biology - You and your genes 0.0 / 5 ? BiologyDNA and inheritanceGCSEOCR Created by: ElnicholsonCreated on: 01-11-15 13:46 92107346518 Across 1. There are characteristics that are controlled by both genes and what other factor? (13) 7. The sex cells are different from ordinary cells because they contain 23 what chromosomes ? (6) 8. Each gene is a code for making a certain what? (7) 10. Alleles are different versions of the same what? (4) Down 2. Is the allele for cystic fibrosis dominant or recessive ? (9) 3. An organisms what is all the genes it has? (8) 4. When an embryo splits into two, it produces _________ twins. (9) 5. The characteristics that an organism displays are called its what? (9) 6. Unspecialised cells that can develop into different cells depending on what instructions they're given are called what? (4, 5) 9. How many pairs of chromosomes does a human cell contain? (6, 5)
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