Haemophilia Is Caused by an X-Linked Recessive Mutation in Humans

question 42

Multiple Choice

Haemophilia is caused by an X-linked recessive mutation in humans.If a woman whose paternal uncle (father's brother) was a haemophiliac marries a man whose brother is also a haemophiliac,what is the probability of their first child having haemophilia? Assume that there are no other cases of haemophilia in the pedigree and no hidden carriers.

• A) 0
• B) 1/4
• C) 1/2
• D) 1/8
• E) 1

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Definitions:

Solo Clutch

A type of clutch designed for individual operation, typically found in vehicle transmissions.

Automatically Adjust

A process where a system or device changes parameters or settings on its own without human intervention, often based on feedback or environmental conditions.

Lockstrap

The removable locking tang that holds the clutch ring in position; it has to be removed and the clutch ring rotated to make a clutch adjustment.

Center Plate

A key component in the articulation systems of rail vehicles or trailers, serving as a pivot point and support between the bogie and the vehicle body.