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Classical genetics

NGSS: HS‑LS3.A
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Introduction to heredityAlleles and genesWorked example: Punnett squaresMendel and his peasThe law of segregationThe law of independent assortmentProbabilities in geneticsIntroduction to heredity review
Practice
Introduction to heredityGet 3 of 4 questions to level up!
Punnett squares and probabilityGet 3 of 4 questions to level up!
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Co-dominance and Incomplete DominanceMultiple alleles, incomplete dominance, and codominancePleiotropy and lethal allelesPolygenic inheritance and environmental effectsNon-Mendelian inheritance review
Practice
Non-Mendelian inheritanceGet 3 of 4 questions to level up!
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Sex-linked traitsExample punnet square for sex-linked recessive traitX-linked inheritanceX-inactivationSex linkage review
Practice
Sex linkageGet 3 of 4 questions to level up!
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PedigreesPedigree for determining probability of exhibiting sex linked recessive traitPedigrees review
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PedigreesGet 3 of 4 questions to level up!

About this unit

Have you ever been told that you have your mother's eyes or grandfather's nose? Learn why traits run in families and how they're passed on. We'll look at Mendel's model of inheritance and learn how it's been revised and extended in the past 150 years.
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