9 : 3 : 3 : 1 ratio is due to

(a)

Segregation

(b)

Crossing over

(c)

Independent assortment

(d)

Recessiveness

The region of the chromosome where the spindle fibres get attached during cell division

(a)

Chromomere

(b)

Centrosome

(c)

Centromere

(d)

Chromonema

The centromere is found at the centre of the ________________ chromosome

(a)

Telocentric

(b)

Metacentric

(c)

Sub-metacentric

(d)

Acrocentric

Okasaki fragments are joined together by ___________________.

(a)

Helicase

(b)

DNA polymerase

(c)

RNA primer

(d)

DNA ligase

The loss of one or more chromosome in a ploidy is called_____________.

(a)

Tetraploidy

(b)

Aneuploidy

(c)

Euploidy

(d)

Polyploidy