Blackening of urine,when exposed to air,is a metabolic disorder in human beings. This is due to:

What will be the genotypes of the parents of a colorblind daughter and a colorblind son?

Which is not a Mendelian disorder in man?

$A$ boy is colour blind. Among his two sisters,one is colour blind and one is a carrier (normal). Who is colour blind in his family?

Consider the following human disorders: $i$. Hemophilia,$ii$. Down's syndrome,$iii$. Cystic fibrosis,$iv$. Color blindness,$v$. Night blindness. Which of these represent Mendelian disorders?

Which genotype is responsible for the carrier state of sickle-cell anemia?