Number of chromosomes in Tobacco is:
Correct answer: B. 48
- A. 45
- B. 48
- C. 46
- D. 47
Explanation
The correct number of chromosomes in tobacco is 48. Tobacco is an allopolyploid species, which means it has multiple sets of chromosomes originating from different species. Each gamete contains 24 chromosomes, resulting in a total of 48 chromosomes in somatic cells. The other options, 45, 46, and 47, do not reflect the correct chromosome count for tobacco. Option A (45) and Option D (47) are incorrect as they do not represent the known chromosome numbers for tobacco. Option C (46) is the diploid number for humans, not tobacco.
This question appeared on the ETEA MDCAT 2013 paper, which you can sit online with every answer explained.
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About Chromosomes
Chromosomes are DNA-protein structures that carry genes and become visible during cell division. Coverage includes chromatin, centromeres, sister chromatids, homologous chromosomes, chromosome number, and the distinction between diploid and haploid cells, with links to DNA replication, mitosis and meiosis.
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