Hemophilia A Pedigree Chart

Hemophilia A pedigree.

This pedigree illustrates a common X-linked recessive inheritance pattern for hemophilia A. Carrier females are marked separately from affected males, making the route through generations easy to follow. An unaffected father and carrier mother can have affected sons, carrier daughters and unaffected children. The carrier daughter in the next generation then has an affected son, which makes the pattern visible without adding unnecessary detail. Clinicians and students use examples like this to discuss why family history matters and which relatives may need assessment. The chart records reported status; it does not establish a diagnosis or replace factor testing and genetic counseling.

種類系図規格 NSGC Pedigree Standardization (Bennett 2008)エンジン schematex-pedigree更新日 2026/9/24

依頼内容

“A hemophilia A pedigree: an unaffected father and carrier mother have an affected son, a carrier daughter, an unaffected son and an unaffected daughter; the carrier daughter and an unaffected partner have an affected son, a carrier daughter and an unaffected son.”

次はこちらMark the affected son in generation three as the proband.Add a deceased affected maternal grandfather.

この図に含まれるもの

図の背後にある意思決定を読み解く。

01X-linked carrier

The mother carries the altered X chromosome.

02Affected males

Two sons show the condition.

03Transmission

A carrier daughter can pass the variant to a son.

Use this pedigree to explain the typical X-linked recessive pattern in a family history.

系図のテンプレートをすべて見る →

よくある質問

Why are males more often affected?

Males have one X chromosome, so one disease-associated change on it can cause an X-linked recessive condition.

What does carrier-x mean?

It marks a female who carries a disease-associated variant on one X chromosome.

Can an unaffected male pass hemophilia A to his son?

No. A father passes a Y chromosome, not his X chromosome, to a son.