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61.

A zygote has:

A.	x number of chromosomes	B.	2 x number of chromosomes
C.	3 x number of chromosomes	D.	4 x number of chromosomes

62.

Number of chromosomes in human karyotype is:

A.	23	B.	46
C.	92	D.	None of these

63.

DNA duplication is:

A.	Conservative	B.	Semiconservative
C.	Complete	D.	Incomplete

64.

Which of these marks the beginning of diploid phase in our life cycle:

A.	Zygote	B.	Sperm
C.	Ovum	D.	None of these

65.

Commencement of diploid phase in the life cycle of an animal is marked by:

A.	Zygote	B.	Microspore
C.	Megaspore	D.	Embryo

66.

A cell cycle has which of the following phases:

A.	G1 and G2 - phase	B.	S - phase
C.	M or D - phase	D.	All of these

67.

Interphase is constituted in cell cycle by:

A.	G1 phase	B.	G2 - phase
C.	S - phase	D.	All of these

68.

Duration of G1 - phase in cell cycle is:

A.	5 hours	B.	10 hours
C.	8 hours	D.	None of these

69.

Duration of S-phase of cell cycle is:

A.	5 hours	B.	8 hours
C.	10 hours	D.	None of these

70.

G2 - phase of cell cycle lasts for about:

A.	5 hours	B.	8 hours
C.	10 hours	D.	1 hours