Teach Genetics: Dominance, Incomplete Dominance & Codominance Lesson/Worksheet

Grade Levels
8th - 11th
Formats Included
  • PDF (6 pages)
  •  Activity
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  1. Teach Genetics with Ease 1 packet: Mendel’s Peas, Complete Dominance and Punnett Squares. (print or version in Google doc):The activity introduces students to dominant and recessive alleles and using Punnett squares to predict inherited traits. Students learn about the work of Gregor Mendel, who i
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Introduce students to incomplete dominance and codominance.

My students have already learned about meiosis, genes and alleles. We have already practiced making Punnett squares to show how alleles are expressed when they have a complete dominance relationship using the Teach Genetics introductory Activity - “Mendel’s Peas, Dominance and Punnett Squares”.

Vocabulary used in this lesson:

  • Complete dominance
  • Incomplete dominance
  • Codominance
  • Alleles
  • Heterozygous
  • Homozygous and Recessive
  • Phenotype and Genotype

This product includes teacher notes, student worksheet and an answer key.

Total Pages
6 pages
Answer Key
Teaching Duration
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to see state-specific standards (only available in the US).
Develop and use a model to describe why asexual reproduction results in offspring with identical genetic information and sexual reproduction results in offspring with genetic variation. Emphasis is on using models such as Punnett squares, diagrams, and simulations to describe the cause and effect relationship of gene transmission from parent(s) to offspring and resulting genetic variation.
Ask questions to clarify relationships about the role of DNA and chromosomes in coding the instructions for characteristic traits passed from parents to offspring. Assessment does not include the phases of meiosis or the biochemical mechanism of specific steps in the process.
Determine the meaning of symbols, key terms, and other domain-specific words and phrases as they are used in a specific scientific or technical context relevant to grades 9–10 texts and topics.
Follow precisely a complex multistep procedure when carrying out experiments, taking measurements, or performing technical tasks, attending to special cases or exceptions defined in the text.


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