Reflection: Checks for Understanding Inheritance Patterns (#5 of 6): Pedigrees - Section 3: Instructional Input/Student Activities


Please refer to pp. 11-12 of the Punnett Square Packet (Student B)

In reviewing the problems #7-14, this student has demonstrated that she understands a number of concepts:

1. How a sex-linked trait passes (and sometimes skips) through generations.

2. Only females can be carriers (due to the fact that they have a double dose of X).

3. The nomenclature system used to interpret pedigrees (labels, half- and full-shade symbols).

4. How to predict the possible future offspring for a sample pairing (Problem #14) with a Punnett Square used to confirm the answer.

What this student failed to grasp was the proper genotype coding to use for sex-linked traits (#11-13). However, when she built the Punnett Square the proper coding was used. This indicates that, being a new system, with time and practice this kind of error will be simply corrected.

Additionally, the proper relationship denoted by the pedigree (p. 12, # 16) is sibling rather than cousin contrary to what she wrote. Furthermore, the student incorrectly identifies 2 daughters (#21) rather than 3 with 1 afflicted with sickle cell anemia as opposed to 2. Lastly, the genotypes required in #22 were not completed. 

Overall, this student's score for this section is 2/4, due to the few minor errors that are easily fixed and the missing content in #22. Note that 2/4 equates to 75% with 88% (3/4) representing standard.

  Checks for Understanding: Pedigrees are not just for dogs!
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Inheritance Patterns (#5 of 6): Pedigrees

Unit 4: 3) Genetics ("Identity & Change")
Lesson 9 of 10

Objective: 1. Students will 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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Science, Heredity, Punnett Squares, incomplete dominance, Sex-linked, Genetics, genetics, pedigrees, Monohybrid Crosses, Dihybrid Crosses, Complete dominance
  55 minutes
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