Unit 5 · 5.6 — Chromosomal Inheritance [cite: 9, 10, 42]

Everything to learn here

• Concept: Chromosomal inheritance patterns track how massive segments of DNA carrying multiple genes are transmitted, occasionally resulting in chromosomal disorders if structurally mutated. *(Note: College Board distributed much of this topic across Units 5 and 6 in the 2025 CED revision, but it remains a distinct heading in the official Course at a Glance)* [cite: 10, 28].
• Skill: FRQ Task Verb "Analyze" — Analyze multi-generational human pedigrees to accurately deduce the specific mode of inheritance (autosomal dominant, autosomal recessive, or sex-linked) [cite: 13, 14, 16].
• Vocabulary: Nondisjunction — An error in meiosis where chromosomes fail to separate, leading to gametes with an incorrect number of chromosomes.
• Concept: Linked genes reside on the same chromosome and are often inherited together unless separated by crossing over during meiosis.

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