Across
- 4. The inherited feature that helps an organism to survive and reproduce in its environment
- 6. Plants that grow submerged or partially submerged in water eg elodea
- 8. Something in the environment eg a disease, which causes the less-adaptive part of the population to die out
- 9. The variation is caused by both genetic and environmental factors which results in a range of phenotypes between two extremes, e.g. body length and body mass
- 12. The process, resulting from natural selection, by which populations become more suited to their environment over many generations
- 13. Plants that can exist in conditions where water is scarce eg cacti
- 14. increases the rate of mutation, along with some chemicals
Down
- 1. A type of chemical that kills bacteria or inhibit their growth.
- 2. The process by which organisms that are well adapted to their environment have a greater chance to breed and pass on their alleles to the next generation than those that are less well adapted.
- 3. A random change in the base sequence of DNA; the way in which new alleles are formed
- 5. Results in a limited number of phenotypes with no intermediates, e.g. Tongue rolling and is mostly caused by genes alone (The environment has no effect. e.g. A, B, AB and 0 blood groups in humans or pea seeds' shape and color
- 7. The selection by humans, of individuals with desirable features and crossing these to produce the next generation. The desirable offspring are then selected to breed
- 10. Bacteria which have a gene that prevents them from being affected by either one antibiotic or several antibiotics
- 11. Differences between individuals of the same species