Correct option is C
Option
(c) is the correctly spelt word.
Correct spelling is:
“Trisomy” — a genetic condition in which a person has
three copies of a chromosome instead of the usual two, such as
Trisomy 21 (Down syndrome). (Hindi meaning of the word:
त्रिगुणसूत्रता/एक क्रोमोसोम की तीन प्रतियाँ)
Example:
Trisomy 21 is one of the most commonly known chromosomal abnormalities.