Which of the following is not an example of trisomy condition in human beings? Identify those and answer from the codes given below:
A. Patau syndrome
B. Edward syndrome
C. Turner syndrome
Codes:

Correct option is C

Correct Answer: (c)
Explanation:
Patau (trisomy 13) and Edward (trisomy 18) are trisomies. Turner syndrome (45,X) is monosomy (loss of one X), not a trisomy. Therefore only (c) is not a trisomy.
Information Booster:
Patau syndrome = Trisomy 13 (severe congenital anomalies).
Edward syndrome = Trisomy 18 (multiple malformations).
Turner syndrome = Monosomy X, female with short stature, gonadal dysgenesis.
Trisomies typically arise from nondisjunction during meiosis.
Common viable autosomal trisomy is Trisomy 21 (Down syndrome).
Additional Information (Incorrect Options):
(a)/(b) include Turner along with a trisomy — incorrect grouping. Only (c) correctly isolates Turner as non-trisomy.