A hereditary disease which is never passed on from father to son is
Autosomal linked disease
$X$-chromosomal linked disease
$Y$-chromosomal linked disease
None of these
$A$ : The heterozygotic female for haemophilia may transmit the disease to sons.
$R$ : Such traits show criss-cross inheritance
Fruit colour in squash is an example of
When different alleles of the same gene are present on an individual, the individual is a
Epicanthus is the symptom of
In man, four phenotypes of blood groups are due to the presence of antigen-$A$ and antigen-$B$ on the $RBC.$ The chromosome that has the gene to control these antigens is