Pedigree Analysis
An autosomal recessive trait typically shows which pedigree pattern?
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About This Question
- Subject
- biology
- Chapter
- genetics and evolution
- Topic
- pedigree analysis
- Difficulty
- Medium
- Year
- 2025
Solution
Correct Answer:
Skips generations with affected often from unaffected parents
- Autosomal Recessive: The trait is carried on a non-sex chromosome and requires two copies of the allele to be expressed.
- Generational Pattern: Unlike dominant traits, recessive ones can skip generations. An individual can be a carrier (Aa) without knowing it.
- Carriers: An affected child (aa) can be born to two phenotypically normal (unaffected) parents if both parents are heterozygous carriers (Aa).
- 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.
This medium difficulty biology question is from the chapter genetics and evolution, covering the topic of pedigree analysis. It appeared in the 2025 exam.
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