Petition of challenge

Four houses claim the same entail and all four submit their tree. The trait is sex-linked: the allele sits on the X chromosome.

One of the four filiations cannot be true. Point it out.

How it is inherited

male · affected male
female · affected female
A son gets his X from the mother.
A daughter gets one X from each parent.
The allele must be on both X chromosomes for a woman to be affected.
Go through the four and mark the one that cannot be.
Civil registry · filiation proceedings · Alcañiz entail
THE FOUR HOUSES
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Succession suit — four trees, one false

THE FOUR HOUSES

The family affliction passes from mothers to sons and reaches women only when it comes to them from both sides. Four houses have submitted their tree to claim the entail, and one of the four describes offspring that no marriage in the world could produce.

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