Select incorrect statement w.r.t. Mendelian disorders.
- AThey are mainly determined by alteration or mutation in a single gene.
- BThey are transmitted to the offspring as per Mendel's principles.
- CExamples include haemophilia, cystic fibrosis, sickle-cell anemia, phenylketonuria, thalassemia and colour blindness.
- DThey always involve disorders of sex chromosomes.
✓ Correct answer: D
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