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ERIC Number: EJ769006
Record Type: Journal
Publication Date: 2007-Jul
Pages: 4
Abstractor: Author
Reference Count: N/A
ISSN: ISSN-0047-231X
The Case Study: I'm Looking over a White-Striped Clover--A Case of Natural Selection
Krufka, Alison; Evarts, Susan; Wilson, Chester
Journal of College Science Teaching, v36 n7 p14-17 Jul 2007
The case presented in this article is an exploration of the process of natural selection using white clover ("Trifolium repens") as an example. In general, two forms of white clover can be found around the world in various habitats. One type has plain green leaves and the other type produces cyanide as a defense against herbivores and signals the presence of cyanide with white stripes on the leaves. The fact that plain clover survives better in Minnesota (where freezing temperatures cause cyanide to be leaked to the entire plant) and striped clover survives better in North Carolina (where there are warmer temperatures and more molluscan herbivores) is used to illustrate the concept of differing selection pressures leading to adaptations specific to different habitats. (Contains 3 resources and 3 tables.)
National Science Teachers Association. 1840 Wilson Boulevard, Arlington, VA 22201-3000. Tel: 800-722-6782; Fax: 703-243-3924; e-mail:; Web site:
Publication Type: Guides - Classroom - Teacher; Journal Articles
Education Level: High Schools; Higher Education
Audience: N/A
Language: English
Sponsor: N/A
Authoring Institution: N/A
Identifiers - Location: Minnesota; North Carolina