Edward's syndrome,Patau's syndrome,and Down's syndrome are due to:

Sometimes,the presence of $XX$ and $XY$ in males is due to:

Epicanthal skin fold and simian crease are characteristics of

$A$ human female with Turner's syndrome:

Read the following statements and choose the correct set of statements :
$(a)$ In sickle cell anaemia the mutant haemoglobin molecule undergoes polymerisation under high oxygen tension
$(b)$ Thalassemia is a qualitative problem
$(c)$ Turner's syndrome,Klinefelter's syndrome are common examples of chromosomal disorders.
$(d)$ Haemophilia is a sex-linked recessive disease

Feminized males have . . . . . . chromosomes.