Atavism is resemblance of child to his: March 2013 (g)
💡 Explanation
## **Core Concept**
Atavism refers to the phenomenon where a child exhibits characteristics or traits that are present in distant ancestors but not in the parents. This concept is rooted in genetics and evolutionary biology.
## **Why the Correct Answer is Right**
The correct answer, **great-great-grandparents**, illustrates the concept of atavism. Atavism occurs when there is a reappearance of a trait or characteristic that had been present in a remote ancestor but was absent in the immediate ancestry of the individual. This can happen due to the presence of recessive genes that are not expressed in the parents but can be passed down through generations.
## **Why Each Wrong Option is Incorrect**
- **Option A: Parents** - Atavism is specifically about resemblance to distant ancestors, not the immediate parents.
- **Option B: Grandparents** - While a child may resemble their grandparents, atavism refers to traits from even more distant ancestors.
- **Option C: Great grandparents** - Although closer than great-great-grandparents, atavism typically implies a more distant ancestral resemblance.
## **Clinical Pearl / High-Yield Fact**
A classic example of atavism is the reappearance of a polydactyly (extra fingers or toes) in a child whose parents do not have the condition but have ancestors who did. This phenomenon highlights the complex inheritance patterns of certain traits.