The defect sickle-cell anaemia is caused by the ______ of glutamic acid by valine at the $6^{th}$ position of the ______ globin chain of the haemoglobin molecule.
Substitution, $\beta$
Deletion, $\alpha$
Duplication, $\beta$
Translocation, $\alpha$
Polyploidy can be induced by the application of
Excessive growth of hair on the pinna is a feature found only in males because
Lyon hypothesis deals with
A distinct mechanism that usually involves a short segment of $DNA$ with remarkable capacity to move from one location in a chromosome to another is called