Turner's Syndrome: Chromosomal Abnormality — NEET Biology
📚 Practice ConceptTurner's Syndrome: Such a disorder is caused due to the absence of one of the X chromosomes, i.e., 45 with X0. Such females are sterile as ovaries are rudimentary besides other features including lack of other secondary sexual characters.
Which of the following statements regarding Turner’s syndrome are NOT correct? S1: Turner’s syndrome is characterised by the presence of an additional X chromosome in females, resulting in a 47, XXX karyotype. S2: Individuals with Turner's syndrome are phenotypically female but typically exhibit rudimentary ovaries and sterility. S3: The condition results from aneuploidy due to the loss of a sex chromosome. S4: The karyotype of an individual with Turner's syndrome is 45, X0. S5: Affected females possess an overall masculine development with gynecomastia.
View solution & NCERT explanation
Correct answer: D — S1 and S5
Turner’s syndrome is a chromosomal disorder. S1 is incorrect because Turner’s syndrome is caused by the absence, not presence, of one X chromosome, resulting in a 45, X0 karyotype, not 47, XXX. S2 is correct as affected individuals are sterile females with rudimentary ovaries. S3 is correct; it is a type of aneuploidy involving the loss of a sex chromosome. S4 is correct, stating the karyotype is 45, X0. S5 is incorrect because overall masculine development with gynecomastia is characteristic of Klinefelter's syndrome, not Turner's syndrome which affects females. Therefore, S1 and S5 are the statements that are NOT correct. The core concept tested is the genetic basis and characteristic features of Turner's syndrome.
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