Question # 1

Man has ____________ linkage group

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23

21

25

46

Mutation of one or two N-bases is

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Inversion

Point mutation

Deletion

Chromosomal aberrations

If six cells out of 10, do crossing over what will be percentage of cross over gametes

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60%

30%

40%

50%

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

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

If the distance of 20 map units is found among two linked loci what would be the percentage of cross gametes

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40%

60%

20%

10%

Two parents of blood group A had a child of blood group O, what will be percentage chances of having such child again

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25%

50%

75%

None

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%

Which of the following traits is not sex-linked recessive ?

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haemophilia

colour blindness

hypophosphatemic ricket

tfm syndrome

A phenotype which can't be expressed in heterozygous state but can only be expressed other in homo or hemi form, would be

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Dominant

Bombay

Recessive

Ordinary

In sickle cell beta chain glutamic acid is replaced by valine which is sixth amino acid from

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N-Terminal

C-Terminal

R-Terminal

H-Terminal

Mutatuons are inherited only if they occur in the

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Gland cells

Gametes

Muscle cells

Somatic cells

Anti-Rh antibodies appear in plasma

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During first few months

During last months

Only when stimulated

If Rh⁺individual mistakenly receives Rh^-blood

The two linked genes A and B with a 30% recombination frequency must be

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15 units apart

30 units apart

60 units apart

90 units apart

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

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

Bilirubin

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Turns skin Yellow

Damages brain cells

Causes jaundice

All of these

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

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condominance

epistasis

pleiotropy

sex-linkage

Point mutation occurs in

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Sickle cell anemia

Phenylketonuria

Alkaptonuria

All

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

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Morgan

Bridges

Correns

De Varies

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