Question

A Trisomic individual has a chromosome number of _____
(A) 2n - 1
(B) 2n + 3
(C) 2n + 1
(D) 2n + 2

Answer 1

Heya..!

Here's your answer...

trisomic individuals are denoted by 2n+1
so, option C is correct.

example for trisomy

-Down's syndrome is trisomic in origin where chromosome21 is in triplicate.
-patau's Syndrome is trisomy of 13th chromosome.


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Answer 2

Dear Student,

● Answer - (C)

A Trisomic individual has a chromosome number of 2n + 1.

● Extra information -

• Type of polysomy in which person has 3 copies of particular chromosome is called trisomy.
• As normal person has 2 copies of each chromosome, only one copy is extra.
• Hence, chromosome number is 2n+1 i.e. total chromosomes are 47.
• Most common trisomys are Down's syndrome (trisomy 21), Edward syndrome (trisomy 18), Patau syndrome (trisomy 13), etc.

Thanks dear. Hope this helps you...