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Question
In Haplopappus gracilis, number of chromosomes in cells of nucellus is 4. What will be the chromosome number in Primary endosperm cell?
Options
8
12
6
2
Solution
6
Explanation:
In Haplopappus gracilis, if the number of chromosomes in the cells of the nucellus is 4 (diploid, 2n = 4), then:
- The haploid (n) chromosome number would be 2.
- The Primary endosperm cell is formed as a result of the fusion of one male gamete (n) with two polar nuclei (n + n) in the process of double fertilization, making it triploid (3n).
Calculation: 3n = 3 × 2 = 6 chromosomes
Therefore, the chromosome number in the Primary endosperm cell will be 6.
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