Natural Selection

• How do you calculate percentage error?

  (Uncertainty/Reading) x 100
• What is genetic diversity?

  The total number of different alleles of genes in a species or population
• What are advantages of high genetic diversity?

  Lots of alleles so species can adapt to changes in environment. Prevents inbreeding and passing on harmful recessive traits.
• What 2 things increase genetic diversity?

  Gene mutations and gene flow
• What is MRSA?

  A type of antibiotic resistant bacteria often present in hospitals
• Why are all alleles not passed from parent to offspring?

  Only some individuals achieve reproductive success. Selection pressure causes some individuals to have a higher chance of reproduction and survival. Beneficial alleles increase from generation to generation.
• How do antivirals work?

  They inhibit virus replication by targeting the enzymes in the host cells used by the virus.
• How do u explain changes in genetic diversity?

  Mutations give rise to new alleles and variation. Some new alleles have selective advantage. These individuals are more likely to survive and reproduce. They will pass on these advantageous alleles to the next generation. Over time the frequency of the alleles increases in the population.
• Why does antibiotic resistance occur?

  Patients don’t finish full course of antibiotics. Antibiotics are over used in agriculture. Antibiotics are over prescribed for minor bacterial infections.
• Where do mutations occur?

  In DNA or in a gene.
• What is genetic diversity?

  The total number of different genes in a population.