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Question
Ploidy of endosperm will be ____ if the male and female parents are hexaploid and tetraploid respectively:
Ploidy of endosperm will be ____ if the male and female parents are hexaploid and tetraploid respectively:
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Solution
The correct option is B 7n
Female plant is tetraploid (4n) so, female gamete and polar nuclei in ovule are diploid (2n). Male plant is hexaploid (6n) so, male gametes are triploid (3n). Endosperm is formed by fusion of two polar nuclei (here 2n) and one male gamete (here 3n). So, endosperm = 2 polar nuclei + 1 male gamete = 2(2n) + 3n = 4n +3n = 7n.
Female plant is tetraploid (4n) so, female gamete and polar nuclei in ovule are diploid (2n). Male plant is hexaploid (6n) so, male gametes are triploid (3n). Endosperm is formed by fusion of two polar nuclei (here 2n) and one male gamete (here 3n). So, endosperm = 2 polar nuclei + 1 male gamete = 2(2n) + 3n = 4n +3n = 7n.
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