Question:
What is the chromosome number of Radish ?
What is the chromosome number of Radish ?
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Radish (*Raphanus sativus*, $2n = 18$) was famously used by Soviet breeder Georgii Karpechenko in 1928 to cross with Cabbage (*Brassica oleracea*, $2n = 18$) to produce the first synthetic intergeneric hybrid, *Raphanobrassica*.
Updated On: Jul 23, 2026
- 2n = 16
- 2n =18
- 2n =20
- 2n = 22
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The Correct Option is B
Solution and Explanation
Step 1: Understanding the Concept:
Every plant species has a characteristic, constant number of chromosomes in its somatic cells.
Knowing these base chromosome numbers is essential for plant breeding, cytogenetics, and hybridization research.
Step 2: Detailed Explanation:
Radish (*Raphanus sativus*) belongs to the family Brassicaceae.
It is a diploid root vegetable species.
Its basic haploid chromosome number is:
\[ x = 9 \]
Therefore, the somatic cells (diploid cells) of a normal cultivated radish contain nine pairs of chromosomes, giving a total of:
\[ 2n = 2x = 18 \text{ chromosomes} \]
This chromosome configuration is highly stable and conserved across most cultivated cultivars of white, red, and black radishes.
Other options like $2n = 16$ (characteristic of species like *Brassica nigra*), $2n = 20$ (*Brassica rapa*), or $2n = 22$ are incorrect for radish.
Step 3: Final Answer:
The diploid chromosome number of Radish is $2n = 18$, corresponding to option (B).
Every plant species has a characteristic, constant number of chromosomes in its somatic cells.
Knowing these base chromosome numbers is essential for plant breeding, cytogenetics, and hybridization research.
Step 2: Detailed Explanation:
Radish (*Raphanus sativus*) belongs to the family Brassicaceae.
It is a diploid root vegetable species.
Its basic haploid chromosome number is:
\[ x = 9 \]
Therefore, the somatic cells (diploid cells) of a normal cultivated radish contain nine pairs of chromosomes, giving a total of:
\[ 2n = 2x = 18 \text{ chromosomes} \]
This chromosome configuration is highly stable and conserved across most cultivated cultivars of white, red, and black radishes.
Other options like $2n = 16$ (characteristic of species like *Brassica nigra*), $2n = 20$ (*Brassica rapa*), or $2n = 22$ are incorrect for radish.
Step 3: Final Answer:
The diploid chromosome number of Radish is $2n = 18$, corresponding to option (B).
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