If a normal woman marries a colourblind man,what will be the phenotype of their children?

  • A
    All their children will be colourblind.
  • B
    All their sons will be colourblind but the daughters will be normal.
  • C
    All the children will have normal vision (daughters will be carriers).
  • D
    All daughters will be colourblind and sons will be normal.

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Thalassaemia is:

In humans,color blindness is caused by:

$A$ - Sickle-cell anaemia is a sex-linked recessive trait.
$R$ - This disease is controlled by more than two pairs of alleles.

Give differences: Haemophilia and Sickle-cell Anaemia.

$A$ couple,neither of whom has sickle cell anemia,has a first child who is affected by sickle cell anemia. What is the probability that their second child will have sickle cell anemia (in $, \%$)?

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