MHT CET · BIOLOGY · STD 12 - 1. Reproduction in Lower and Higher Plants
An angiospermic male plant with 24 chromosomes in its pollen mother cells is crossed with female plant bearing 24 chromosomes in its root cells. What would be the ploidy of embryo and endosperm respectively formed after this cross?
- A 24 and 48
- B 24 and 24
- C 48 and 72
- D 24 and 36
Answer & Solution
Correct Answer
(D) 24 and 36
Step-by-step Solution
Detailed explanation
The diploid pollen mother cells have 24 chromosomes, hence pollen grains will have 12 chromosomes. Thus, the male gametes will have 12 chromosomes. The female gamete being haploid will also have 12 chromosomes. Hence, syngamy will form diploid zygote with 24 chromosomes. Triple fusion will involve three haploid nuclei with 12 chromosomes each. Thus, the triploid endosperm will have 36 chromosomes.
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