MCQ
Heart beats are accelerated by
- ACranial nerves and acetylcholine
- BSympathetic nerves and acetylcholine
- CCranial nerves and adrenaline
- ✓Sympathetic nerves and epinephrine
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Reason : Genotype is the type of hereditary properties of an organism.
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Reason : Haemophilia occurs due to mutation of a structural gene on chromosome $15$.