The "cri-du-chat" syndrome is caused by change in chromosome structure involving
Deletion
Duplication
Inversion
Translocation
Which of the following disorders is not hereditary
One of the parents of a cross has mutation in its mitochondria. In that cross, that parent is taken as a male. During segregation of $F_{2}$-progenies that mutation is found in
The phenomenon of incomplete dominance was observed by
Which of the statement is correct
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.