Students analyze real pedigree charts to determine inheritance patterns using evidence.
This interactive lesson develops student skill in interpreting pedigree charts by focusing on three inheritance patterns: dominant traits, recessive traits, and sex-linked recessive traits. All examples use real human conditions so students can connect abstract patterns to biological reality.
Students begin by examining three modeled traits:
ectrodactyly (dominant)
albinism (recessive)
color blindness (sex-linked recessive)
For each case, students mark key features directly on the pedigree to identify visual clues associated with each inheritance pattern. This process establishes a systematic method for analyzing pedigrees rather than relying on guesswork.
Students then:
complete a chart of diagnostic clues for each inheritance type
compare how different patterns appear across generations
practice applying these rules to new pedigrees
In the application phase, students analyze six additional pedigree charts showing different human traits and determine the most likely inheritance pattern for each case.
The lesson emphasizes:
recognition of generational patterns
use of evidence from family data
distinction between autosomal and sex-linked inheritance
structured reasoning about genotype and phenotype
This lesson is designed to support:
mastery of pedigree interpretation
understanding of inheritance mechanisms
application of genetics concepts to real cases
preparation for more advanced genetic analysis
It functions well as:
a core lesson on pedigrees
a guided practice activity
or a reinforcement lesson within a heredity unit
NGSS Alignment (High School):
HS-LS3-1, HS-LS3-2, HS-LS3-3
NGSS Alignment (Middle School):
MS-LS3-1, MS-LS3-2
Science & Engineering Practices (SEPs):
Developing and Using Models; Analyzing and Interpreting Data; Constructing Explanations
Crosscutting Concepts (CCCs):
Patterns; Cause and Effect; Structure and Function
Common Core (Literacy in Science):
RST.9-10.4, RST.11-12.4
RST.9-10.7, RST.11-12.7
WHST.9-10.2, WHST.11-12.2
Students analyze real pedigree charts to determine inheritance patterns using evidence.
This interactive lesson develops student skill in interpreting pedigree charts by focusing on three inheritance patterns: dominant traits, recessive traits, and sex-linked recessive traits. All examples use real human conditions so students can connect abstract patterns to biological reality.
Students begin by examining three modeled traits:
ectrodactyly (dominant)
albinism (recessive)
color blindness (sex-linked recessive)
For each case, students mark key features directly on the pedigree to identify visual clues associated with each inheritance pattern. This process establishes a systematic method for analyzing pedigrees rather than relying on guesswork.
Students then:
complete a chart of diagnostic clues for each inheritance type
compare how different patterns appear across generations
practice applying these rules to new pedigrees
In the application phase, students analyze six additional pedigree charts showing different human traits and determine the most likely inheritance pattern for each case.
The lesson emphasizes:
recognition of generational patterns
use of evidence from family data
distinction between autosomal and sex-linked inheritance
structured reasoning about genotype and phenotype
This lesson is designed to support:
mastery of pedigree interpretation
understanding of inheritance mechanisms
application of genetics concepts to real cases
preparation for more advanced genetic analysis
It functions well as:
a core lesson on pedigrees
a guided practice activity
or a reinforcement lesson within a heredity unit
NGSS Alignment (High School):
HS-LS3-1, HS-LS3-2, HS-LS3-3
NGSS Alignment (Middle School):
MS-LS3-1, MS-LS3-2
Science & Engineering Practices (SEPs):
Developing and Using Models; Analyzing and Interpreting Data; Constructing Explanations
Crosscutting Concepts (CCCs):
Patterns; Cause and Effect; Structure and Function
Common Core (Literacy in Science):
RST.9-10.4, RST.11-12.4
RST.9-10.7, RST.11-12.7
WHST.9-10.2, WHST.11-12.2
