Question # 1

SRY in located at the tip of

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Short arm of X-chromosome

Short arm of Y-chromosome

Long arm of Y-chromosome

Long arm of X-chromosome

Point mutation occurs in

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Sickle cell anemia

Phenylketonuria

Alkaptonuria

All

Man has ____________ linkage group

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23

21

25

46

Which enzyme deficiency leads to phenylketonuria

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Phenylalanine oxidase

Phenylalanine hydroxylase

Phenylalanine synthase

Phenylalanine carboxylase

Who for the first time found white eye mutant in drosophila ?

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Morgan

Bridges

Correns

De Varies

A change in one or more bases of DNA, which results in the formation of an abnormal protein is

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Moulting

Transformation

Mutation

Fission

Mutation of one or two N-bases is

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Inversion

Point mutation

Deletion

Chromosomal aberrations

Interaction of two loci

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Pleiotropy

Epistasis

Dominance

Differentiation

A carrier mother for colour blindness does not have

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A normal boy

A carrier boy

A colour blind boy

A normal daughter

The chances of which hemophilia is equal in males & females

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A

B

C

All

Pseudo-autosomal genes are present on

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X-chromosome

Y-chromosome

Both a & b

Autosomes

Genes for alpha and beta chains of hemoglobin are found on which chromosomes?

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Chromosome 16 alpha; chromosome 11 beta

Chromosome 11 alpha; chromosome 16 beta

Chromosome 11

Chromosome 16

What will be the risk of heamophilia in sons if father is haemophilic and mother is normal

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0%

20%

25%

50%

Degenerated testes are present in abdomen in which of these cases

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Down's syndrome

Klinefelter's sysndrome

Turner's syndrome

Testicular ferminization

When a single gene has multiple phenotypic effects, the phenomenon is called:

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condominance

epistasis

pleiotropy

sex-linkage

How many kinds of rhodopsins, a blue cone monochromate will have

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3

2

1

No rhodopsins

What is the probability of having albino child if father and mother both are carrier(Aa)

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25%

30%

50%

75%

What happens when both alleles of a gene pair independently express in a heterozygote?

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dominance

incomplete dominance

over dominance

codominance

What are chances for having Rh-ve baby if one parent is Rh+ve and (homozygous) and other is Rh-ve

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25%

50%

100%

0%

Rh factor is encoded by

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2 genes which occupy 3 loci

3 genes which occupy 2 loci

2 genes which occupy 2 loci

3 genes which occupy 3 loci

What is the 5th amino acid in sickle cell beta chain

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Histidine

Proline

Leucine

Valine

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