a man and a woman who do not show any apparent signs of certain inherited disease, have seven children (2 daughters and 5 sons). three of the sons suffer from the given disease but none of the daughters is affected. which of the following mode of inheritance do you suggest for this disease.

1.  sex-linked dominant

2.  sex-linked recessive

3.  sex-limited recessive

4.  autosomal dominant

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4
Correct Answer :

sex-linked recessive


Explanation :
No Explanation available for this question

the salivary gland chromosomes in the dipteran larvae, are useful in gene mapping because

1.  these are fused

2.  these are much longer in size

3.  these are easy to stain

4.  they have endoreduplicated chromosomes

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4
Correct Answer :

they have endoreduplicated chromosomes


Explanation :
No Explanation available for this question

Assertion: persons suffering from haemophilia fail to produce blood clotting  factor Reason: prothrombin  producing platelets in such persons are found in very low concentration

1.  if both are true with reason being correct explanation

2.  both true but reason is not correct explanation

3.  assertion true but reason is wrong

4.  both are wrong

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4
Correct Answer :

assertion true but reason is wrong


Explanation :
No Explanation available for this question

assertion : in humans the gamete contributed by the male determines whether the child produced will be male or female reason: sex in humans is polygenic trait depending upon a cumulative effectof some genes on X-chromosome and some on Y-chromosomes

1.  if both are true with reason being correct explanation

2.  both true but reason is not correct explanation

3.  assertion true but reason is wrong

4.  both are wrong

View Answer  
4
Correct Answer :

assertion true but reason is wrong


Explanation :
No Explanation available for this question

Assertion: senescence is the time, when age associated defects are manifested Reason: certain genes may be undergoing sequential switching on and off during one's life

1.  both true but reason is not correct explanation

2.  if both are true with reason being correct explanation

3.  assertion true but reason is wrong

4.  both are wrong

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4
Correct Answer :

both true but reason is not correct explanation


Explanation :
No Explanation available for this question

Grain colour in wheat is determined by three pairs of polygenes. Following the cross AA BB CC(dark colour) X aa bb cc (light colour), in F2 generation what proportion of progeny is likely to resemble either parent

1.  None

2.  Less than 5%

3.  One third

4.  Half

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4
Correct Answer :

Less than 5\%


Explanation :
No Explanation available for this question

The Cri-du-chat syndrome is caused by change in chromosome structure involving

1.  Deletion

2.  Duplication

3.  Inversion

4.  Translocation

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4
Correct Answer :

Deletion


Explanation :
No Explanation available for this question

Primary source of allelic variation is

1.  Independent assortment

2.  Recombination

3.  Mutation

4.  Polyploidy

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4
Correct Answer :

Recombination


Explanation :
No Explanation available for this question

In Drosophila, gene for white eye mutation is also responsible for depigmentation of body parts. Thus a gene that controls several phenotypes is called

1.  Oncogene

2.  Epistatic gene

3.  Hypostatic gene

4.  Pleiotropic gene

5.  Sex-linked gene

View Answer  
5
Correct Answer :

Pleiotropic gene


Explanation :
No Explanation available for this question

Blackening of urine when exposed to air is a metabolic disorder in human beings.This is due to

1.  Phenylalanine

2.  Tyrosine

3.  Valine replacing glutamine

4.  Homogentistic acid

5.  Glutamine replacing valine

View Answer  
5
Correct Answer :

Homogentistic acid


Explanation :
No Explanation available for this question
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