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  • Number of chromosomes of a monosomic individual whose 2n number is 12 will be :  Option: 1 11  <div class='qna-

Number of chromosomes of a monosomic individual whose 2n number is 12 will be :
 

Option: 1

11
 


Option: 2

13
 


Option: 3

12
 


Option: 4

14


Answers (1)

best_answer

 

 

As discussed in Chromosomal Number Mutations -

Aneuploidy:

  • Aneuploidy is a type of mutation in the chromosome number wherein the ploidy (chromosome number) of the new individual is different from its wild type. 
  • This is typically a result of the nondisjunction of chromosomes during mitosis or meiosis, hence producing offspring with either extra or lost chromosomes.
  • The naming of aneuploid conditions is generally based on the number of chromosomes added or deleted:
    • An aneuploid in which one chromosome is devoid of its homolog is called monosomic (2n-1). 
    • An aneuploid in which a complete pair of homologous chromosomes is absent is called nullisomic (2n-2).
    • An aneuploid in which an extra chromosome is present is called trisomic (2n+1).

In the given question, 
2n = 12 Therefore, n = 12/2 which will be n = 6.
In monosomic individual, chromosomes are  present in the form (2n - 1)
Therefore, (2x6 -  1) = (12 - 1) = 11
Hence, 11 number of chromosomes are present in a monosomic individual.
Hence, the correct option is (a).

 

 

Posted by

himanshu.meshram

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