The given diagram $A$ and $B$ indicates:

Who is known as the father of human genetics?

In sickle-cell anaemia,which of the following amino acids is substituted?

Give scientific reasons: The human male never passes on the gene for haemophilia to his son.

$A$ man and a woman,who do not show any apparent signs of a certain inherited disease,have seven children ($2$ daughters and $5$ sons). Three of the sons suffer from the given disease but none of the daughters are affected. Which of the following modes of inheritance do you suggest for this disease?

Sickle-cell anaemia is caused by the following mutant gene mutation ($DNA$ level):