Question
Question: Haemophilia is a condition in which blood fails to clot only very slowly. Studies of this human sex-...
Haemophilia is a condition in which blood fails to clot only very slowly. Studies of this human sex-linked trait show that
A
Every X chromosome carries the dominant allele.
B
A Y chromosome never carries the dominant allele.
C
Both X and Y chromosome can bear the recessive allele.
D
Neither X nor Y chromosomes can bear the recessive allele.
Answer
A Y chromosome never carries the dominant allele.