$A$ normal woman, whose father had colour blindness, married a normal man. What is the chance of occurrence of colour blindness in the progeny?
$25\;\%$
$50\;\%$
$100\;\%$
$75\;\%$
How many nucleosomes are found in helical coil of $30\ nm$ chromatin fibre
Philadelphia chromosome is
When a segment of a chromosome breaks and later rejoins after $180^{\circ}$ rotation,it is known as
Change of male and female parents during crosses is known as
The first plant in which chromosomal basis of sex determination was discovered is