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  • An individual  having trisomy has a chromosome number of :  Option: 1 2n-1  <stron

An individual  having trisomy has a chromosome number of :
 

Option: 1

2n-1
 


Option: 2

2n+2 
 


Option: 3

2n+1
 


Option: 4

2n+3
 


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).

Hence, the correct option is (c).
 

Posted by

Ritika Jonwal

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