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Evolution of Caffeine Producing Plants (KEY)

Biologycorner
852 Followers
Grade Levels
10th - 12th
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Standards
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Biologycorner
852 Followers

Description

Students use uniprot to compare the amino acid sequences of caffeine synthase, which is a protein that produces caffeine in tea, coco, and coffee plants. The sequence reveals that the sequences are not very similar. Students then read and abstract from a science journal and analyze a phylogenetic tree showing the common ancestors of these plants.

The activity uses a 5E lesson plan (engage, explain, explore, elaborate, evaluate) though it is largely self paced. Students can do it as homework.

This worksheet is available for free at https://www.biologycorner.com/worksheets/evolution-caffeine.html

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Standards

to see state-specific standards (only available in the US).
NGSSHS-LS4-5
Evaluate the evidence supporting claims that changes in environmental conditions may result in (1) increases in the number of individuals of some species, (2) the emergence of new species over time, and (3) the extinction of other species. Emphasis is on determining cause and effect relationships for how changes to the environment such as deforestation, fishing, application of fertilizers, drought, flood, and the rate of change of the environment affect distribution or disappearance of traits in species.
NGSSHS-LS4-2
Construct an explanation based on evidence that the process of evolution primarily results from four factors: (1) the potential for a species to increase in number, (2) the heritable genetic variation of individuals in a species due to mutation and sexual reproduction, (3) competition for limited resources, and (4) the proliferation of those organisms that are better able to survive and reproduce in the environment. Emphasis is on using evidence to explain the influence each of the four factors has on number of organisms, behaviors, morphology, or physiology in terms of ability to compete for limited resources and subsequent survival of individuals and adaptation of species. Examples of evidence could include mathematical models such as simple distribution graphs and proportional reasoning. Assessment does not include other mechanisms of evolution, such as genetic drift, gene flow through migration, and co-evolution.

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