NEETBotanySexual Reproduction in Flowering Plants
If the endosperm of an angiospermic plant contains 36 chromosomes, what will be the number of chromosomes in its antipodal cell and megaspore mother cell (MMC) respectively?
Options
- A18 and 36
- B12 and 12
- C24 and 12
- D12 and 24
Correct answer
D. 12 and 24
Step-by-step solution
In angiosperms, the endosperm is a triploid ( 3n ) structure formed as a result of triple fusion. Given the chromosome number of the endosperm ( 3n ) = 36 . Therefore, the haploid chromosome number ( n ) = 36 3 = 12 . Antipodal cells are haploid ( n ) structures located at the chalazal end of the embryo sac. Thus, an antipodal cell will have 12 chromosomes. The megaspore mother cell (MMC) is a diploid ( 2n ) cell that undergoes meiosis to form megaspores. Thus, the MMC will have 2 12 = 24 chromosomes. The correct s