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

(a)

Tetraploidy

(b)

Aneuploidy

(c)

Euploidy

(d)

Polyploidy

The haploid condition in a human cell refers to________ chromosomes

(a)

44

(b)

23

(c)

46

(d)

22

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

Down's syndrome is a case of___________

(a)

Euploidy

(b)

Deletion

(c)

Translocation

(d)

Aneuploidy

________is a gene mutation

(a)

Deletion

(b)

Duplication

(c)

Translocation

(d)

Ploidy

Hydrogen bonds between the nitrogeneous bases make the DNA molecule________

(a)

unstable

(b)

stable

(c)

unbalanced

(d)

disturbed