## 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).

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

# Inheritance Patterns (#4 of 6): Sex-linked Traits

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

Print Lesson
5 teachers like this lesson
Standards:
Subject(s):
Science, Heredity, Punnett Squares, incomplete dominance, Sex-linked, Genetics, genetics, pedigrees, Monohybrid Crosses, Dihybrid Crosses, Complete dominance
55 minutes

### Mitchell Smith

##### Similar Lessons

###### Using Simulations to Discuss Basic Concepts in Evolution
High School Biology » Unit 8: Evolution & Biological Diversity
Big Idea: Make concepts like the bottleneck effect, non-random mating, and stabilizing, disruptive, and directional selection come to life for students with these great online tools!
Favorites(5)
Resources(20)
Walnut Creek, CA
Environment: Suburban

###### Conversations of Genetics: Two Stories of Huntington's Disease
High School Science » Genetics and the Brain
Big Idea: Understanding the impact of Huntington's disease involves a delicate balance of conversations with counselors and genetic calculations!
Favorites(0)
Resources(17)
Charlotte, NC
Environment: Urban

###### Flu Tracking (Part 1/3)
Biology » Viruses
Big Idea: Will it be a bad flu season this year? Use actual data to track the spread of the true flu.
Favorites(2)
Resources(19)
Randolph, KS
Environment: Rural