Mississippi Science GEN.4.3
The Standard
- GEN.4
- Students will analyze and interpret data collected from probability calculations to explain the inheritance of traits within a population.
Investigate traits that follow non-Mendelian inheritance patterns (e.g., incomplete dominance, codominance, multiple alleles, autosomal linkage, sexlinkage, polygenic, and epistasis).
2026 Mississippi College- and Career-Readiness Standards for Science · Classic Mendelian Genetics
Teacher's field guide
What This Standard Means
What Students Need to Do
- Students compare crosses, pedigrees, and trait data to identify inheritance patterns beyond simple dominance. They look for traits that show both alleles, traits shaped by several genes, and genes that mask other genes. They also examine multiple alleles, genes linked on autosomes, and sex-linked traits.
What Mastery Looks Like
- Students predict a 1 red:2 pink:1 white ratio from an RW × RW snapdragon cross and explain why AB blood shows both A and B. They use a pedigree to predict X-linked traits and spot autosomal linkage when parental trait pairs outnumber new combinations. They recognize polygenic traits by a range of outcomes and explain why ee masks B alleles in Labrador coat color.
Common Misconceptions
- Students may call pink snapdragons codominance or think one person carries all three ABO alleles. They may expect linked genes to assort independently, think X-linked traits affect only boys, or treat yellow Labrador coats as a third B allele.
How to Assess It
- On an exit ticket, give students these cases: RW snapdragons are pink, AB blood shows both A and B, and ee Labradors are yellow regardless of their B alleles. Ask them to name each inheritance pattern and predict the colors from an RW × RW cross.
Lesson moves
Ways to Teach It
Give pairs R and W snapdragon allele cards; have students model RW as pink and sort offspring from an RW × RW cross.
Draw a pedigree for a carrier mother and unaffected father; ask which children could have X-linked color blindness and why.
Run an ABO card sort: match IAIA, IAi, IBIB, IBi, IAIB, and ii to blood types, then explain AB.
Use a Labrador breeder's BbEe × bbee cross; have students predict black, brown, and yellow puppies and mark where ee masks B.
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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.
- 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...
- 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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