Which of the following is NOT a transmissible character?

Analyze the question: "Transmissible character" here means a trait that can be passed from parents to offspring through genes (an inherited trait). We need the one that is NOT inherited.

Concept:

• Inherited (hereditary) characters are controlled by genes and passed through gametes.
• Acquired characters develop during a person's lifetime through environment, exercise, injury, or training. They are not passed on to offspring because they don't change the genes in the gametes (Lamarck's idea of inheriting acquired traits was disproved).

Step-by-step check of each option:

• A. Dimple cheek: Controlled by genes, so it is inherited.
• B. Ability to roll tongue: A classic genetic trait, so it is inherited.
• C. Colour blindness: A sex-linked recessive trait carried on the X chromosome, so it is inherited.
• D. Sickle-cell anaemia: Caused by the HbS gene mutation, so it is inherited.
• E. Big muscles of a boxer: These develop from training and exercise. This is an acquired character, so it is not passed on to children.

**Answer: E.

Tip: Ask yourself, "Did the person get it from their genes, or from what they did or what happened to them?" Things like muscles from training, scars, amputations, and skills learned are acquired, so they are not transmissible. Things like blood groups, albinism, and haemophilia are inherited.