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!

Inheritance Patterns (#5 of 6): Pedigrees

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

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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Standards:
Subject(s):
Science, Heredity, Punnett Squares, incomplete dominance, Sex-linked, Genetics, genetics, pedigrees, Monohybrid Crosses, Dihybrid Crosses, Complete dominance
55 minutes

Mitchell Smith

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