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Question
What would be the ploidy of the PEN when a hexaploid flowering plant is cross pollinated with pollen grains of a tetraploid plant?
What would be the ploidy of the PEN when a hexaploid flowering plant is cross pollinated with pollen grains of a tetraploid plant?
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Solution
The correct option is C 8n
Pollen grains are taken from a tetraploid (4n) plant. So, the male gamete will be 2n. The polar nuclei belong to a hexaploid (6n) plant. So, they will be 3n. The PEN (primary endosperm nucleus) is formed by the fusion of a male gamete with two polar nuclei inside the ovule. So, the ploidy of the PEN with be 2n + 3n + 3n = 8n.
Pollen grains are taken from a tetraploid (4n) plant. So, the male gamete will be 2n. The polar nuclei belong to a hexaploid (6n) plant. So, they will be 3n. The PEN (primary endosperm nucleus) is formed by the fusion of a male gamete with two polar nuclei inside the ovule. So, the ploidy of the PEN with be 2n + 3n + 3n = 8n.
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