Principle of Inheritance and VariationMediumBloom L3
Question
Which one of the following symbols and its representation, used in human pedigree analysis is correct?
Options
A.
= mating between relatives
= mating between relativesB.
= unaffected male
= unaffected maleC.
= unaffected female
= unaffected femaleD.
= male affected
= male affectedSolution
Sol.(a) [Key Concept: Pedigree Analysis — Symbols] In human pedigree analysis, the correct symbol is: A DOUBLE HORIZONTAL LINE between a square and circle = mating between relatives (consanguineous mating). Standard pedigree symbols: Square = male; Circle = female; Filled shape = affected individual; Unfilled shape = unaffected; Single horizontal line = mating; Vertical line = offspring. Option (b) is wrong (circle = female, not male); option (c) is wrong (square = male, not female); option (d) is wrong (diamond is not used for males).
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