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Making More Yeasty Beasties

Time Frame:
1 class period that runs 70 minutes.

Group Size:
Small Groups


Students will investigate what variables affect the rate of asexual reproduction in yeast.

Main Curriculum Tie:
SEEd - Grade 7 (2017)
Strand 7.4: Reproduction and Inheritance 7.4.2

Obtain, evaluate, and communicate information about specific animal and plant adaptations and structures that affect the probability of successful reproduction. Examples of adaptations could include nest building to protect young from the cold, herding of animals to protect young from predators, vocalization of animals and colorful plumage to attract mates for breeding, bright flowers attracting butterflies that transfer pollen, flower nectar and odors that attract insects that transfer pollen, and hard shells on nuts that squirrels bury.


  • yeast
  • warm or cold water
  • 2 test tubes
  • triple beam
  • stop watch
  • sugar
  • ruler
  • graph paper
  • student worksheet


Student Prior Knowledge:
Students should know that yeast reproduce asexually by budding or splitting in two. They will need help knowing how to handle lab equipment and how to set up a lab with only one variable in it.

Instructional Procedures:

  1. Say "Yeast is a fungus that reproduces asexually. You are going to look at what affects the rate of reproduction by mixing a yeast solution and seeing how it expands in a test tube. By noting the starting point of your yeast solution and the end level, you can make an estimate of how much reproduction has occurred.
  2. You and your partner decide how you want to set up the lab.
  3. You will need a test tube for the “control” tube and for the “test” tube.
  4. Make sure that the tubes are different in only ONE way."
  5. Students complete the procedures on their worksheet.

Assessment Plan:
Scoring Guide:

Correctly written hypothesis………….4
Design has only one variable…………4
Correct handling of lab equipment……4
Correctly written conclusion…………..4

Lesson Design by Jordan School District Teachers and Staff.

Utah LessonPlans

Created Date :
Oct 03 2014 14:00 PM

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