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In a pedigree, a horizontal line connecting two individuals represents:
ASibling relationship
BRandom
CGenetic similarity
DMarriage (mating); vertical line below leads to offspring
Answer & Solution
Correct answer: D. Marriage (mating); vertical line below leads to offspring
Pedigree symbols: ○ female, □ male. Horizontal line connecting = mating. Vertical line below = offspring. Filled = affected, blank = unaffected. Half-filled = carrier. Pedigrees trace inheritance patterns across generations.
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