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Trisomy X and Other Conditions

Question

Haploid number is $10.$ What shall be the tetrasomic number?
$22$
$18$
$20$
$19$

A

22

B

20

C

19

D

18

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Solution

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Tetrasomy is possessing four instead of the usual pair of chromosomes in an otherwise diploid cell; that is, having a chromosome number of 2n + 2.
Relating to a cell nucleus in which one chromosome is represented four times, whereas all others are present in the normal number.
So here 10 is the haploid number. tetrasomic number is 2n+2= 2*10+2=22
So, the correct answer is '22'

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