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#Y-linked traits

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Pedigree Analysis

Y-linked traits

Because Y chromosome exists exclusively in males under normal karyotype, Y-linked traits manifest solely in male individuals and follow strict paternal lineage inheritance without exception. Daughters do not inherit Y from father, so they never express nor transmit Y-linked trait to next generation. While pedigree might appear to skip generation if affected male has only daughters, generally trait appears in every generation via affected fathers to sons. Unlike autosomal or X-linked traits, no female carriers exist, simplifying recognition of holandric transmission.

Ref: Hartl & Ruvolo, Genetics, 6th ed., Chapter 4: Holandric Male-Limited Inheritance Patterns

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Pedigree Analysis

Y-linked traits are

Y chromosome transmission is exclusively paternal to male offspring, absent in female offspring because daughters receive paternal X. Genes located in non-recombining male-specific region of Y therefore show holandric inheritance pattern: affected father passes allele to every son, who in turn passes to all of his sons indefinitely. No females ever express trait nor transmit it. Examples include SRY sex-determining factor and some spermatogenesis genes. Such all-male paternal line pattern cannot be explained by autosomal or X-linked inheritance because daughters would be affected.

Ref: Griffiths et al., Introduction to Genetic Analysis, 12th ed., Chapter 4: Y-linked Inheritance Characteristics

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