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61.

Which one of these is sex-linked inheritance?

A.	Night blindness	B.	Colour blindness or haemophilia
C.	Disbetes melletus	D.	Myopia

62.

Which of these genotypes and phenotyes may be the correct result of aneuploidy in sex chromosomes:

A.	22 pairs + XXY males	B.	22 pairs + XY males
C.	22 pairs + XXY females	D.	22 pairs + Y males

63.

A son must be born to a couple when:

A.	Mother eats well during the period of pregnancy	B.	Father has good health than the mother
C.	The zygote composition has XY combination	D.	The zygote composition has XX chromosomes

64.

If father of a body is haemophilic and mother a carrier, then chances of the body in inheriting the disease will be:

A.	0%	B.	50%
C.	75%	D.	100%

65.

In which of these situations the daughter of a colour blind fater can be colour blind:

A.	If the mother is genotypically and phenotypically normal	B.	If the mother is phenotypically normal but genotypically is carrier
C.	If both of these conditions exist	D.	If none of these conditions exist

66.

An autosome means:

A.	Half chromosome	B.	A sex chromosome
C.	A cytoplasmic structure	D.	None of these

67.

If a haemophilic father marries a normal woman the children will be:

A.	All haemophilic	B.	All normal
C.	Haemophilic daughters	D.	Haemophilic sons

68.

Haemophilia is caused by the deficiency of:

A.	Thromboplastin	B.	RBCs
C.	WBCs	D.	None of these

69.

Colour blindness generally affects males but factor for it is transmitted to boys through mother, this is because the factor is located on:

A.	X-chromosome	B.	Y-chromosome
C.	Both (a) & (b)	D.	None of these

70.

Cause of red-green colour blindness is:

A.	Excessive drinking	B.	Vitamin deficiency
C.	Inheritance	D.	None of these