Changing Environments
Changing Environments
Changing Environments
* Enduring understanding 1.C: Life continues to evolve within a changing environment.
* Enduring understanding 1.C: Life continues to evolve within a changing environment.
-Essential knowledge 1.C.1: Speciation and extinction have occurred throughout the Earth's history.
-Essential knowledge 1.C.1: Speciation and extinction have occurred throughout the Earth's history.
- a. Speciation rates can vary, especially when adaptive radiation occurs when new habitats become available.
- b. Species extinction rates are rapid at times of ecological stress.
- Learning Objectives:
- LO 1.20: The student is able to analyze data related to questions of speciation and extinction throughout the Earth's history.
- LO 1.21: The student is able to design a plan for collecting data to investigate the scientific clam that speciation and extinction have occurred throughout the Earth's history.
- Learning Objectives:
-Essential knowledge 1.C.2: Speciation may occur when two populations become reproductively isolated from each other.
-Essential knowledge 1.C.2: Speciation may occur when two populations become reproductively isolated from each other.
- a. Speciation results in diversity of life forms. Species can be physically separated by a geographic barrier such as an ocean or a mountain range, or various pre- and post-zygotic mechanisms can maintain reproductive isolation and prevent gene flow.
- b. New species arise from reproductive isolation over time, which can involve scales of hundreds of thousands or even millions of years, or speciation can occur rapidly through mechanisms such as polyploidy in plants.
- Learning Objectives:
- LO 1.22: The student is able to use data from a real or simulated population(s), based on graphs or models of types of selection to predict what will happen to the population in the future.
- LO 1.23: The student is able to justify the selection of data that address questions related to reproductive isolation and speciation.
- LO 1.24: The student is able to describe speciation in an isolated population and connect it to change in gene frequency, change in environment, natural selection and/or genetic drift.
- Learning Objectives:
-Essential Knowledge 1.C.3: Populations of organisms continue to evolve.
-Essential Knowledge 1.C.3: Populations of organisms continue to evolve.
a. Specific evidence supports the idea that evolution has occurred in all species.
b. Scientific evidence supports the idea that evolution continues to occur.
- Learning Objectives:
- LO 1.25: The student is able to describe a model that represents evolution within a population.
- LO 1.26: The student is able to evaluate given data sets that illustrate evolution as an ongoing process.
