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  • Both Drosophila and mammals have an XY system of sex determination. Dosage compensation through inactivation of one X chromosome is seen in Option: 1</

Both Drosophila and mammals have an XY system of sex determination. Dosage compensation through inactivation of one X chromosome is seen in 

Option: 1

Mammals


Option: 2

Drosophila


Option: 3

Males of Drosophila


Option: 4

All of these


Answers (1)

best_answer

 

 

 

As we have studied in:

Dosage Compensation, Barr Body & Lyon Hypothesis -

  • In man, it has been found that Y-chromosomes are genetically inert in comparison to the X-chromosomes and other chromosomes and only a few genes are present in the human Y-chromosome.
  • As per the chromosomal make-up of human male and female, females contain a higher dose of a functional gene containing chromosome than males (Female chromosome numbers = 44 + XX and Male chromosome number = 44 + XY).
  • The mechanism of compensating the differential doses of functional sex chromo­somes in male and female human is affected by the inactivation of one X-chromosome in the normal female. 
  • The genetically inactive X- chromosome or condensed X-chromosome is called heterochromatin or sex-chromatin body or Barr body.

- 

 

Dosage compensation through inactivation of one of the X-chromosomes is seen in females (XX) of mammals.

Hence, the correct answer is option a.

Posted by

Rishabh

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