Reflection: Real World Applications Inheritance Patterns (#4 of 6): Sex-linked Traits - Section 3: Instructional Input/Student Activities


Please refer to pp. 6-10 of the Punnett Square Packet (Student A).

Sex-Linked Traits-

In reviewing this students work, the following remarks can be made:

#4 & 5) An incorrect pairing of parental genotypes was made but a correct Punnett Square set up with resulting correct ratios was seen.

#6) The answer ought to be 50% of males (=50) plus 100% of females (=200) for a total of 50+200 = 250. Answer correctly accounted for projected value for males but females were only half the correct value.

The correct genotype symbols for males and females (both affected, unaffected, and carriers).

Problems #7-10 are correctly set up with accurate genotypic and phenotypic ratios.

Dihybrid Cross Problems-

#1 & 4) Correctly set up (FOIL), paired gametes in Punnett Square, and interpreted (geno., pheno. ratios)

#2) Incorrect FOIL technique for father's alleles (along left column of Punnett Square. It ought to be ME, Me, mE, and me (instead of mE). This affects the resulting ratios and probably resulted from rushing through the problem.

#3) Correctly set up (FOIL), paired gametes in Punnett Square, however an incorrect interpretation of each square resulting in wrong predicted ratios.

Overall I would score this set of solutions as a 2.5/4 with 3 being meets standard. Despite a few clerical mistakes, it is evident that the main concepts are demonstrated and with a little more attention to detail would score 3 or higher.

  Real World Applications: Adding more layers to the Punnett Square
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Inheritance Patterns (#4 of 6): Sex-linked Traits

Unit 4: 3) Genetics ("Identity & Change")
Lesson 8 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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