The chromosome number in the male gamete of a rice plant is 12. We need to determine the chromosome number in the female gamete, zygote, and cells of the seedling.

Chromosome Number in Female Gamete:
In most organisms, including plants, the female gametes are produced through a process called meiosis. Meiosis is a specialized form of cell division that reduces the chromosome number by half. Therefore, the chromosome number in the female gamete is expected to be half of the chromosome number in the male gamete.

So, the chromosome number in the female gamete of the rice plant will be:
12 ÷ 2 = 6

Chromosome Number in Zygote:
When the male and female gametes fuse during fertilization, they form a zygote. The zygote contains a complete set of chromosomes, with half coming from the male gamete and half from the female gamete. Therefore, the chromosome number in the zygote will be the sum of the chromosome numbers in the male and female gametes.

So, the chromosome number in the zygote of the rice plant will be:
12 + 6 = 18

Chromosome Number in Cells of Seedling:
After fertilization, the zygote undergoes multiple rounds of cell division to form a seedling. During these divisions, the chromosomes are replicated, and the new cells receive a complete set of chromosomes. Therefore, the chromosome number in the cells of the seedling will be the same as the chromosome number in the zygote.

So, the chromosome number in the cells of the seedling of the rice plant will be:
18

To summarize:
- The chromosome number in the male gamete of the rice plant is 12.
- The chromosome number in the female gamete is 6.
- The chromosome number in the zygote is 18.
- The chromosome number in the cells of the seedling is also 18.

Chromosome in male gamete of riceplant is n=12 .
so female gamete is also 12 .
zygote is 2n=24. cells of seedling wouldbe meiocytes..2n=24...