pedigree analysis

Question

An autosomal recessive trait typically shows which pedigree pattern?

RankGuru · Accepted Answer

1. **Autosomal Recessive**: The trait is carried on a non-sex chromosome and requires two copies of the allele to be expressed.
2. **Generational Pattern**: Unlike dominant traits, recessive ones can **skip generations**. An individual can be a carrier ($Aa$) without knowing it.
3. **Carriers**: An affected child ($aa$) can be born to two phenotypically **normal (unaffected) parents** if both parents are heterozygous carriers ($Aa$).
4. **Other Patterns**:
   - **Autosomal Dominant**: Usually seen in every generation.
   - **X-linked Recessive**: More common in males; affected fathers do NOT pass the trait to sons.
   - **Y-linked**: Passed only from father to son.

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pedigree analysis

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