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Turner’s syndrome is caused by monosomy of the X chromosome (45, XO), leading to sterility and other developmental issues. This follows from NCERT principle where the relation explains the outcome clearly for students in simple steps.
Ref: NCERT Biology Textbook for Class XI and XII (Botany section), Chapter: Biology - Botany portion covering relevant concept.
Down’s syndrome is caused by trisomy of chromosome 21, leading to developmental and cognitive impairments. This follows from latest NCERT 2026-27 principle explaining the concept clearly for NEET students in simple steps as per rationalized syllabus.
Ref: NCERT Biology Textbook - Latest Edition for Academic Session 2026-27 (Botany section, Rationalized Textbook for Class XI and XII), Chapter: Biology - Botany portion (Latest NCERT Textbooks for Academic Session 2026-27 -
Klinefelter’s syndrome results from an extra X chromosome (47, XXY), leading to a total of 47 chromosomes. This follows from NCERT principle where the relation explains the outcome clearly for students in simple steps.
Ref: NCERT Biology Textbook for Class XI and XII (Botany section), Chapter: Morphology and Anatomy of Flowering Plants, Topic: Plant structure and tissue systems.
Turner’s syndrome is caused by monosomy of the X chromosome (45, XO), leading to sterility and other developmental issues.
Ref: NCERT Class 12 Biology Chapter 4: Principles of Inheritance and Variation Sex Determination Mutation and Genetic Disorders
Patau syndrome is caused by trisomy of chromosome 13, leading to severe developmental abnormalities.
Ref: NCERT Class 12 Biology Chapter 4: Principles of Inheritance and Variation Monohybrid Dihybrid and Test Cross
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