Genetic diversity

• What are the 3 adaptations ?

  Anatomical-Structural features

  Physiological-Chemical reactions

  Behavioural-Organism behaves
• What is genetic diversity?

  Is the number of different alleles of genes in a population.
• What is necessary for natural selection to occur?

  Genetic diversity within a population
• What is natural selection?

  It is the process leading to evolution
• What is evolution defined as?

  Change in allele frequency over generations
• What is a result of natural selection?

  Species become better adapted to their environment
• What are the types of adaptations in organisms?

  • Anatomical adaptations: structural features
  • Physiological adaptations: chemical reactions
  • Behavioral adaptations: organism behaviors
• What does physiological adaptation refer to?

  Different chemical reactions within the body
• How does behavioral adaptation help organisms?

  It increases their chances of survival
• How do anatomical, physiological, and behavioral adaptations differ?

  • Anatomical: structural features
  • Physiological: internal chemical processes
  • Behavioral: actions for survival
• What is the process described by natural selection?

  Natural selection describes the survival and reproduction of advantageous traits.
• How are new alleles for a gene created?

  New alleles are created by random mutations.
• What happens if a new allele increases survival chances?

  It is more likely to be passed on through reproduction.
• What is the result of advantageous alleles being passed on over generations?

  The new allele increases in frequency in the population.
• What are the types of selection in natural selection?

  • Directional selection
  • Stabilizing selection
• What occurs during directional selection?

  One extreme trait has a selective advantage.
• When does directional selection occur?

  It occurs when there is a change in the environment.
• What is stabilizing selection?

  The modal trait has the selective advantage.
• When does stabilizing selection occur?

  It occurs when there is no change in the environment.
• What happens to the standard deviation in stabilizing selection?

  Standard deviation decreases as extreme traits decrease.
• What are the risks of low birth weight in humans?

  Underdeveloped organs and lower survival chances.
• What are the risks of high birth weight in humans?

  Increased risk for the mother during birth.
• What is the most common human birth weight range?

  6 to 9 pounds.
• Desribe the process of natural selection?


  • New alleles for a gene are created by random mutations
  • If the new alleles increases the chances of the individuals to survive in that environment,more likey to survive and reproduce due to adaptations
  • This reproduction passes on the advantageous allele to the next generation.
  • As a result, over many generations the new allele increases in frequency in the population.
• What is the acronym to describe the process of natural selection?


  N- New alleles create random

  M- mutations

  S- New alleles are increasing the chances of the individuals to survive in that environment.

  R- reproduce

  P- passes on the advantagous allele to the next

  G- generation

  N- Over many generations the new allele increases in frequency in a population
• What is the definition of evolution?


  -The change in allele frequency over many generation in a population.