Step-by-Step Practice with Dominant, Recessive, and Sex-Linked Traits.
This guided digital lesson teaches students how to analyze pedigree charts by assigning possible genotypes and using that information to predict genetic outcomes. It is designed to support students as they develop one of the most challenging procedural skills in introductory genetics.
Students begin with direct, scaffolded instruction that models how to interpret pedigree symbols and apply inheritance rules. The lesson walks students through three common pedigree types: simple dominant traits, simple recessive traits, and sex-linked recessive traits. At each stage, students use evidence from the pedigree to eliminate impossible genotypes and justify their conclusions.
As students gain confidence, they apply the same reasoning independently. Practice problems require students to assign genotypes to individuals in a pedigree and then predict possible offspring genotypes and phenotypes. The emphasis throughout the lesson is on logical constraint-based reasoning, not memorization or guesswork.
This lesson works well as:
a core instructional day within a genetics unit
a structured introduction to pedigree analysis before assessments
targeted support for students who struggle with inheritance reasoning
The lesson is fully digital, clearly sequenced, and designed to fit within a single class period. A teacher key and optional literacy-based exit ticket support assessment and follow-up.
Digital pedigree chart lesson (Google Slides)
Guided instruction for dominant, recessive, and sex-linked pedigrees
Independent pedigree practice problems
Teacher key
Linked printable exit ticket
To preview this lesson, click here.
NGSS Alignment (High School):
HS-LS3-1; HS-LS3-2; HS-LS3-3
Science & Engineering Practices (SEPs):
Developing and Using Models
Analyzing and Interpreting Data
Constructing Explanations
Crosscutting Concepts (CCCs):
Cause and Effect
Systems and System Models
Patterns
Common Core (Literacy in Science):
CCSS.ELA-LITERACY.RST.9-10.7; CCSS.ELA-LITERACY.WHST.9-10.9
Step-by-Step Practice with Dominant, Recessive, and Sex-Linked Traits.
This guided digital lesson teaches students how to analyze pedigree charts by assigning possible genotypes and using that information to predict genetic outcomes. It is designed to support students as they develop one of the most challenging procedural skills in introductory genetics.
Students begin with direct, scaffolded instruction that models how to interpret pedigree symbols and apply inheritance rules. The lesson walks students through three common pedigree types: simple dominant traits, simple recessive traits, and sex-linked recessive traits. At each stage, students use evidence from the pedigree to eliminate impossible genotypes and justify their conclusions.
As students gain confidence, they apply the same reasoning independently. Practice problems require students to assign genotypes to individuals in a pedigree and then predict possible offspring genotypes and phenotypes. The emphasis throughout the lesson is on logical constraint-based reasoning, not memorization or guesswork.
This lesson works well as:
a core instructional day within a genetics unit
a structured introduction to pedigree analysis before assessments
targeted support for students who struggle with inheritance reasoning
The lesson is fully digital, clearly sequenced, and designed to fit within a single class period. A teacher key and optional literacy-based exit ticket support assessment and follow-up.
Digital pedigree chart lesson (Google Slides)
Guided instruction for dominant, recessive, and sex-linked pedigrees
Independent pedigree practice problems
Teacher key
Linked printable exit ticket
To preview this lesson, click here.
NGSS Alignment (High School):
HS-LS3-1; HS-LS3-2; HS-LS3-3
Science & Engineering Practices (SEPs):
Developing and Using Models
Analyzing and Interpreting Data
Constructing Explanations
Crosscutting Concepts (CCCs):
Cause and Effect
Systems and System Models
Patterns
Common Core (Literacy in Science):
CCSS.ELA-LITERACY.RST.9-10.7; CCSS.ELA-LITERACY.WHST.9-10.9
