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21.

Homologous chromosomes include:

A.	One smaller and one larger chromosomes	B.	One chromosome from each parent
C.	One complete and one incomplete chromosome	D.	None of these

22.

Sickle-cell anaemia is a case of:

A.	Complete dominance	B.	Incomplete dominance
C.	Both (a) & (b)	D.	None of these

23.

Sickling of RBCs occurs in 50% of which of these:

A.	Homozygous dominant forms	B.	Homozygous recessive forms
C.	Heterozygous forms	D.	None of these

24.

In which of these disorders the accumulation of gentisie acid in joints cause arthritis::

A.	Phenylketonuria	B.	Alkaptonuria
C.	Both (a) & (b)	D.	None of these

25.

What is the incedence of occurrence of phenylketonruia in human population?

A.	One in 1000	B.	One in 10,000
C.	One in 18,000	D.	One in 500

26.

In phenylketonuria the conversion of phenylakanine is disturbed due to absence of the enzyme:

A.	Phenylalanine oxidase	B.	Phenylalanine hydroxylase
C.	Phenylalanine phosphorylase	D.	Phenylalanine transmutase

27.

Phenotype of phenylketonura shows:

A.	Mental retardation	B.	Eczema on skin
C.	Abnormal bones & teeth	D.	All of these symptoms as mentioned baove

28.

Absence of melanin is termed:

A.	Albinism	B.	Daltonism
C.	Both (a) & (b)	D.	None of these

29.

Incedence of ablinism is:

A.	One per 200	B.	One per 2000
C.	One per 20,000	D.	None of these

30.

Albinism is exhibited by:

A.	White skin, pink eyes and normal hair	B.	Pink skin, pink eyes and white hairs
C.	White hairs, normal eyes and pink skin	D.	None of these