Mississippi Science BIO.3B.4
The Standard
- BIO.3B
- Students will analyze and interpret data collected from probability calculations to explain the variation of expressed traits within a population.
Analyze and interpret data (e.g., pedigrees, family, and population studies) regarding Mendelian and complex genetic traits (e.g., sickle-cell anemia, cystic fibrosis, muscular dystrophy, color-blindness, and hemophilia) to determine patterns of inheritance and disease risk.
2026 Mississippi College- and Career-Readiness Standards for Science · Reproduction and Heredity
Teacher's field guide
What This Standard Means
What Students Need to Do
- Students read pedigrees and tables of family or population data. They identify likely inheritance patterns and calculate risks for single-gene traits. For complex traits, they compare group rates without treating risk as a guarantee.
What Mastery Looks Like
- A student uses relatives in a pedigree to support a likely inheritance pattern. They calculate a 25% risk for each child of two cystic fibrosis carriers. They report complex trait risk from data, not a Punnett square.
Common Misconceptions
- Students may think unaffected parents cannot have an affected child. They may treat a 25% chance as one affected child in every four births. They may assume a family pattern proves that a complex trait has one cause.
How to Assess It
- Exit ticket: Two unaffected parents have a child with cystic fibrosis. Name the likely inheritance pattern, assign parent genotypes, and calculate the chance their next child is affected.
Lesson moves
Ways to Teach It
Give pairs paper cards for two unaffected parents and an affected daughter, then have them draw a pedigree and label possible genotypes.
Ask students to sketch X and Y transmission and explain why a father with red-green color blindness does not automatically have affected sons.
Label opposite sides of two coins A and a, flip them 20 times, and compare affected offspring counts with the expected 25%.
Show fictional clinic data: type 2 diabetes affects 8 of 20 people with an affected parent and 2 of 20 without; compare rates.
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Related Standards
- GEN.4.4
Construct pedigrees from observed phenotypes. Analyze and interpret data to determine patterns of inheritance and disease risk.
- GEN.4.3
Investigate traits that follow non-Mendelian inheritance patterns (e.g., incomplete dominance, codominance, multiple alleles, autosomal linkage, sexlinkage, pol...
- BIO.3B.3
Investigate traits that follow non-Mendelian inheritance patterns (e.g., incomplete dominance, codominance, multiple alleles in human blood types, and sex-linka...
- FB.4.3
Use models (e.g., Punnett squares) and mathematical reasoning to describe and predict patterns of inheritance of single genetic traits from parents to offspring...
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