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Question

Difficulty: MediumBlood Relations

A genetic researcher is analyzing a three-generation pedigree chart containing six individuals: K, V, W, X, Y, and Z. The clinical notes reveal the following structure:

- Z is the paternal grandfather of Y.
- X is the only son of Z.
- W is the sister of X.
- V is the daughter-in-law of Z.
- K is the son of W.
- Y is the daughter of V.

Match the individuals on the left with their exact relationship to Y on the right.

  • WPaternal Aunt
  • KFirst Cousin
  • ZPaternal Grandfather
  • VMother

Answer

W matches with Paternal Aunt, K matches with First Cousin, Z matches with Paternal Grandfather, and V matches with Mother.
By systematically mapping the pedigree chart: Z is the grandfather, and his children are X (son) and W (daughter). X is married to V, and they have a daughter Y. W has a son K. Therefore, relative to Y, W is the paternal aunt, K is the first cousin, Z is the paternal grandfather, and V is the mother.

Step-by-Step Solution

1
Identify Y's father based on the grandfather relationship.
X is the father of Y.
Since Z is Y's paternal grandfather, Y's father must be a son of Z. The notes state that X is the only son of Z, so X must be the father.
2
Determine the relationship between V, X, and Y.
V is the mother of Y.
V is the daughter-in-law of Z, meaning she is married to Z's only son, X. Since Y is the daughter of V, and X is V's husband, V is Y's mother.
3
Determine the relationship of W to Y.
W is Y's paternal aunt.
W is the sister of X, who is Y's father. A father's sister is defined as a paternal aunt.
4
Determine the relationship of K to Y.
K is Y's first cousin.
K is the son of W. Since W is Y's aunt, her son K is Y's first cousin.

Key Concept

Multi-generational Family Tree Analysis
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Topics

Blood Relations

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