Pick out the correct statements:

(a) Haemophilia is a sex-linked recessive disease.

(b) Down's syndrome is due to aneuploidy.

(c) Sickle cell anaemia is an X-linked recessive gene disorder.

(d) Phenylketonuria is an autosomal recessive gene disorder.

  • Option 1)

    (a) and (d) are correct.

  • Option 2)

    (b) and (d) are correct.

  • Option 3)

    (a), (c) and (d) are correct.

  • Option 4)

    (a), (b) and (c) are correct.

 

Answers (1)
V Vakul

 

Haemophilia -

This is sex-linked recessive disease, which shows transmission from unaffected carrier female to some of the male progeny.

- wherein

In this, a simple cut will result in non-stop bleeding and no blood clotting will take place.

 

 

Down's Syndrome -

It is a chromosomal disorder caused due toa gain of extra copy of chronosome.

 

- wherein

The affected indivisual is short, of small round head, burrowed  tounge and partially open mouth.

 

 

Sickle cell and anaemia -

This is an autosome linked recessive trait that can be transmitted when both parents are the carrier of the gene.

- wherein

This disease is controlled by a single pair of allele - Hb^{A}\:and \:Hb^{S}

 

 

 

 

 

 


Option 1)

(a) and (d) are correct.

This is incorrect option

Option 2)

(b) and (d) are correct.

This is incorrect option

Option 3)

(a), (c) and (d) are correct.

This is incorrect option

Option 4)

(a), (b) and (c) are correct.

This is correct option

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