Explain how mass vaccination can reduce the spread of a disease. Define: Gene Allele Dominant recessive What is homeostasis? Give 2 examples. Explain how mass vaccination can reduce the spread of a disease. Define: Species What is biodiversity? Why is it important? Describe the steps in producing an artificial clone. Define: Blind trial Double-blind trial Open-label trial placebo Define: Heterozygous Homozygous Phenotype genotype Why do you look similar to your parents but not identical to either of them? How does antibiotic resistance develop? Why is it a problem? Describe the role of different groups of bacteria in the nitrogen cycle. What are the stages in natural selection? What are the symptoms of cystic fibrosis and Huntington’s disease? What are the types of stem cell and an advantage/ disadvantage of each? How are arteries and veins adapted for their functions? What is evolution? What evidence is there for evolution? Describe the pathway taken by a carbon atom in the carbon cycle. What are the 3 stages of drug development? Use a Punnett square to show the offspring from 2 carriers of cystic fibrosis. Describe 3 issues surrounding genetic testing. Where is ADH produced? What does it do? What is a living indicator? Give 2 examples. Compare and contrast selective breeding and natural selection. What is the effect of alcohol on urine production? How does a gene on the Y chromosome cause embryos to develop into males? The heart is a double pump – explain what this means. Explain why you are immune to most disease that you have already had. Why do organisms compete for resources in their environment? Give 3 ways that energy is lost at each stage in the food chain. What are the uses of genetic testing? How many chromosomes are found in sex cells? Explain why identical twins may have differences. How can lifestyle affect health? What makes a good study? What is interdependence? Give 3 factors that can lead to extinction.