In the following human pedigree, the filled symbols represent the affected individuals. Identify the type of given pedigree.
Autosomal recessive
$X$-linked dominant
Autosomal dominant
$X$-linked recessive
Give scientific reasons : The human male never passes on the gene for haemophilia to his son.
One of the following is not true to haemophilia
Which one is ineffective against antibiotics
Thalassaemia is
In pedigree analysis, symbol given for sex unspecified is