Mississippi Science BIO.3B.3
The Standard
- BIO.3B
- Students will analyze and interpret data collected from probability calculations to explain the variation of expressed traits within a population.
Investigate traits that follow non-Mendelian inheritance patterns (e.g., incomplete dominance, codominance, multiple alleles in human blood types, and sex-linkage).
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 predict offspring traits when both alleles show, neither allele fully masks the other, or a trait has more than two allele forms in a population. They also track traits carried on the X chromosome through families.
What Mastery Looks Like
- Students can use parent genotypes to list possible flower colors and blood types in offspring. They can read an X-linked family chart and explain why a father does not pass his X chromosome to his sons.
Common Misconceptions
- Students may think pink flowers mean the alleles themselves blended, or that AB blood is a separate allele. They may think one person carries all three ABO alleles or that fathers pass X-linked traits to sons.
How to Assess It
- Exit ticket: Parents have AO and BO blood genotypes. List their children's possible blood types, explain how AB blood differs from pink flowers produced by red and white parents, and say whether a father passes his X chromosome to a son.
Lesson moves
Ways to Teach It
Have students pair red and white allele cards, then attach a pink flower card to show incomplete dominance.
Ask students to write why a person with AB blood has both A and B markers, rather than a blend.
Give pairs four X-linked color-vision crosses to solve, then have them match each cross to possible child outcomes.
Give students a mock blood bank report with A and B antigen test results and ask them to identify the person's blood type.
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Related Standards
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Construct pedigrees from observed phenotypes. Analyze and interpret data to determine patterns of inheritance and disease risk.
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Investigate traits that follow non-Mendelian inheritance patterns (e.g., incomplete dominance, codominance, multiple alleles, autosomal linkage, sexlinkage, pol...
- 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...
- BIO.3B.4
Analyze and interpret data (e.g., pedigrees, family, and population studies) regarding Mendelian and complex genetic traits (e.g., sickle-cell anemia, cystic fi...
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