9 : 3 : 3 : 1 ratio is due to

(a)

Segregation

(b)

Crossing over

(c)

Independent assortment

(d)

Recessiveness

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 sex chromosomes in a human cell refer to the______

(a)

22^nd pair

(b)

20^th pair

(c)

23^rd pair

(d)

21^st pair

L shaped chromosomes are described as_______

(a)

acrocentric

(b)

metacentric

(c)

submetacentric

(d)

telocentric

______is not a nitrogenous base.

(a)

Adenine

(b)

Thymine

(c)

Leucine

(d)

Cytosine

Choose the correct pair

(a)

A ≡ T

(b)

G ≡ A

(c)

A ≡ C

(d)

G ≡ C

Franklin and Wilkin were awarded nobel prize for_______.

(a)

studying DNA replication

(b)

studying about RNA

(c)

X - ray diffraction studies of DNA.

(d)

isolating DNA

________is a gene mutation

(a)

Deletion

(b)

Duplication

(c)

Translocation

(d)

Ploidy

In human, each cell normally consists _________of chromosomes.

(a)

23 pairs

(b)

22 pairs

(c)

20 pairs

(d)

12 pairs