Question:
Polyploidy level of cultivated strawberry
Polyploidy level of cultivated strawberry
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The cultivated strawberry (Fragaria × ananassa) is a classic example of an allopolyploid in horticulture. It is an octoploid (8x), resulting from natural hybridization of two other octoploid wild species. This high ploidy level contributes to its large fruit size and vigor.
Updated On: Jul 2, 2026
- Diploid
- Triploid
- Octoploid
- Hexaploid
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The Correct Option is C
Approach Solution - 1
Polyploidy refers to the state of having more than two complete sets of chromosomes. Different plant species have different levels of ploidy.
The commonly cultivated strawberry, Fragaria × ananassa, is a well-known example of a polyploid plant.
Wild strawberry species exist at various ploidy levels, including diploid (2x), tetraploid (4x), hexaploid (6x), and octoploid (8x).
The cultivated garden strawberry (Fragaria × ananassa) originated from hybridization between two octoploid American species: Fragaria virginiana and Fragaria chiloensis.
Therefore, the cultivated strawberry is an octoploid, meaning it has eight sets of chromosomes. Its chromosome number is 2n = 8x = 56 (where x is the basic chromosome number, 7). Let's look at the options:
(1) Diploid: Some wild strawberry species are diploid, but not the common cultivated one.
(2) Triploid: Triploids exist in some plants but are not typical for cultivated strawberry.
(3) Octoploid: This is the correct ploidy level for Fragaria × ananassa.
(4) Hexaploid: Some wild strawberry species are hexaploid. Octoploid
Wild strawberry species exist at various ploidy levels, including diploid (2x), tetraploid (4x), hexaploid (6x), and octoploid (8x).
The cultivated garden strawberry (Fragaria × ananassa) originated from hybridization between two octoploid American species: Fragaria virginiana and Fragaria chiloensis.
Therefore, the cultivated strawberry is an octoploid, meaning it has eight sets of chromosomes. Its chromosome number is 2n = 8x = 56 (where x is the basic chromosome number, 7). Let's look at the options:
(1) Diploid: Some wild strawberry species are diploid, but not the common cultivated one.
(2) Triploid: Triploids exist in some plants but are not typical for cultivated strawberry.
(3) Octoploid: This is the correct ploidy level for Fragaria × ananassa.
(4) Hexaploid: Some wild strawberry species are hexaploid. Octoploid
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Approach Solution -2
Direct chromosome-count approach:
The basic chromosome number in Fragaria is \( x = 7 \). The cultivated garden strawberry, Fragaria × ananassa, carries \( 2n = 56 \) chromosomes.
Dividing the somatic count by the basic number gives the ploidy level: \( \dfrac{56}{2 \times 7} = 4 \), i.e. \( 2n = 8x = 56 \), which is octoploid.
Diploid, triploid and hexaploid strawberries do exist in the wild Fragaria gene pool, but none of them is the commercially cultivated type, so Octoploid is correct.
The basic chromosome number in Fragaria is \( x = 7 \). The cultivated garden strawberry, Fragaria × ananassa, carries \( 2n = 56 \) chromosomes.
Dividing the somatic count by the basic number gives the ploidy level: \( \dfrac{56}{2 \times 7} = 4 \), i.e. \( 2n = 8x = 56 \), which is octoploid.
Diploid, triploid and hexaploid strawberries do exist in the wild Fragaria gene pool, but none of them is the commercially cultivated type, so Octoploid is correct.
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