Reflection: Routines and Procedures Inheritance Patterns (#2 of 6): Incomplete Dominance - Section 3: Instructional Input/Student Activities


I model the process. In this case it is a seven-step method for determining the outcome of a Punnett Square problem (AKA monohybrid cross). It will be noted that she documented the steps of this process for future reference (bottom of p. 1). Smart choice!

We solve problems together. Using students as guides/helpers I want them to begin doing the heavier cognitive work as the baton (mastery) is passed along. This constitutes #1-4 on p. 1, done as a class.

You (student) solve problems independently. Student B (one of two students featured in this series) demonstrates that she understands the relationship between the incompletely dominant and incompletely recessive alleles and how, when paired in different combinations, they will produce different results when compared with a truly dominant trait. Furthermore, she understands how the statistical outcomes are produced and rightly documents all possible genotypic and phenotypic categories and accounts for (nearly*) all gametes.

She understands (problem #11) that two purebred horses (brown and white) give 100% offspring that are palomino (hybrid) therefore this is the quickest way to produce this variety. She can use the system to solve problems of a hypothetical nature as well (#12-15).


*It should be noted that she mismarked square #2 for problem #4 (Pink v. Pink) but correctly noted the genotypic and phenotypic ratios. This is a clerical error (oversight) of step #5 of the process, not one of a conceptual nature which, in my view, is a minor fix.

  Routines and Procedures: I-We-You: Transferring the "academic baton"
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Inheritance Patterns (#2 of 6): Incomplete Dominance

Unit 4: 3) Genetics ("Identity & Change")
Lesson 6 of 10

Objective: 1. Students will be able to apply concepts of statistics and probability to explain the variation and distribution of expressed traits in a population. (HS-LS-3) 2. Students will understand that cells store and use genetic information to guide their functions. An organism’s genotype determines its phenotype. These traits can be dominant or recessive depending on the alleles found on their genes.

Big Idea: Nearly all human traits, even many diseases, are inherited in predictable ways. Using the tools of mathematics and modeling, these inheritance patterns can be properly deduced.

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6 teachers like this lesson
Science, Heredity, Punnett Squares, incomplete dominance, Sex-linked, Genetics, genetics, pedigrees, Monohybrid Crosses, Dihybrid Crosses, Complete dominance
  50 minutes
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