Disorders inherited according to Mendel's laws of inheritance are called:

$A$ man with normal vision whose father was colourblind marries a woman whose father was also colourblind. Suppose their first child is a daughter,what are the chances of this child being colourblind (in $\%$)?

Haemophilia is a:

Thalassemia and sickle-cell anemia are caused by problems in the synthesis of globin molecules. Select the correct statement.

$A$ colourblind daughter is born when:

Albinism is known to be due to an autosomal recessive mutation. The first child of a couple with normal skin pigmentation was an albino. What is the probability that their second child will also be an albino (in $\%$)?