Explanation

A transomic individual has one extra chromosome (2n+1), while a trisomic individual also has 2n+1. However, the term 'transonic' is likely a typo for 'trisomic' or 'transomic'. In standard genetics MCQs, 'trisomic' refers to 2n+1. Wait, let's re-read carefully. The question says 'transonic'. This is almost certainly a typo for 'trisomic'. Trisomy is 2n+1. But wait, sometimes 'translocation' carriers are discussed. However, looking at the options (2n+1, 2n+2, etc.), these refer to aneuploidy numbers. Trisomy = 2n+1. Monosomy = 2n-1. Nullisomy = 2n-2. Tetrasomy = 2n+2. The question likely meant 'trisomic'. If it meant 'trisomic', the answer is A. If it meant 'monosomic', the answer is D. Given 'transonic' sounds like 'trisomic', A is plausible. However, 'transomic' is a valid term for trisomy in some contexts? Actually, 'transomic' is rarely used; 'trisomic' is standard. Let's check if 'transonic' is a known typo in PrepBeePakistan databases. Often, these questions come from specific books. A common question is: 'A trisomic individual has chromosome number...?' Answer: 2n+1. Another possibility: The question meant 'Monosomic'? No, 'transonic' is closer to 'trisomic'. I will stick with A being the intended answer for 'trisomic', assuming a typo in the question text provided by the user or the source. However, if the question strictly says 'transonic', it might be nonsense. But in MCQ contexts, we assume standard typos. Trisomy = 2n+1. So A is correct. Wait, let's double check. Is there a term 'transomic'? Yes, sometimes used interchangeably with trisomic in older texts? Or maybe the question meant 'Tetrasomic'? No. I'll assume the question meant 'Trisomic'. Answer A is 2n+1. This matches Trisomy. So the current answer A is likely correct despite the typo in the question word. I will mark it as correct. Confidence high because 'transonic' is a clear typo for 'trisomic' in this context of chromosome numbers. Explanation should note the typo assumption. Actually, looking at similar MCQs online, 'A trisomic individual has... 2n+1'. The text 'transonic' is definitely a typo. I will confirm A. Result: suggestedCorrectAnswer A, isCurrentAnswerCorrect true. Confidence high. Explanation: The term 'transonic' is likely a typo for 'trisomic', which refers to an individual with one extra chromosome (2n+1). Thus, option A is correct.