Assessment Anchor BIO.B.3 Theory of Evolution
Anchor Descriptor BIO.B.3.1 Explain the mechanisms of evolution.
Eligible Content BIO.B. Describe the factors that can contribute to the development of new species (e.g., isolating mechanisms, genetic drift, founder effect, migration).
Enhanced Standard 3.1.B.C1, 3.1.B.C2
Assessment Anchors & Eligible Content

Essential Learnings
  • Describe species as reproductively distinct groups of organisms.
  • Analyze the role that graphic isolation can play in speciation.
  • Explain how evolution through natural selection can result in changes in biodiversity through the increase or decrease of genetic diversity within a population.
  • Describe how the degree of kinship between species can be inferred from the similarities in their DNA sequences.

  • Describe the theory suggesting that life on Earth arose as a single, primitive prokaryote about 4 billion years ago and that for the next 2 billion years, a huge diversity of single-celled organisms evolved.
  • Analyze how increasing complex, multicellular organisms evolved once cells with nuclei developed.
  • Describe how mutations in sex cells may be passed on the successive generations and that the resulting phenotype may help, harm, or have little or no effect on the offspring's success in the environment.
  • Describe the relationshil between environmental changes and changes in the gene pool of a population.

isolating mechanisms - features of behavior, morphology, or genetics which serve to prevent breeding between species.
genetic drift -Random fluctuations in the frequency of the appearance of a gene in a small isolated population, presumably owing to chance rather than natural selection.
founder effect- the loss of genetic variation that occurs when a new population is established by a very small number of individuals from a larger population.
migration -a behavior in which animals move from place to place in response to the season of the year.
genetic bottleneck - an event in which a significant percentage of a population or species is killed or otherwise prevented from reproducing.[1]
genetic variation - variation in alleles of genes, occurs both within and among population.
competion -the struggle among living living things to their needs for life.
evolution - a change in the heredity features of a group of organisms over time.
extinct - a life-form that no longer exists.
fertile - being able to reproduce by forming egg and sperm cells.
natural selection - the process in which something in a living thing's surroundings determines if it will or will not survive to have offspring.
primate -mammals with eyes that facr forward, a well-developed cerebrum, and thumbs that can be used for grasping.
species -the smallest group of living thing; a group of living things that can breed with others of the same species and form fertile offspring.
variation - a trait that makes an individual different from others of its species.
vestigial structure -a body part that no longer has a function.


  • Rubric is with the material/resources for bird adaptation.
  • Making the penny baby
  • Questions

Technology/ Web Connections

  • Enlarging print for students that are vision impaired.
  • On tapes for students that are hearing impaired.
  • If students need to type can get voice reconition for computer

Extension Activities


"Bottlenecks and Founder Effects." The University of California Museum of Paleontology, Berkley and the Regents of the University of California. 2006. Web. Received on October 26 2011.
"Genetic Drift." The University of California Museum of Paleontology, Berkley and the Regents of the University of California. 2006. Web. Received on October 26 2011