Question

The male gametes of rice plant have $12$ chromosomes in their nucleus. The chromosome number in the female gamete, zygote and the cells of the seedling will be, respectively

• A. $12$, $24$, $12$
• B. $24$, $12$, $12$
• C. $12$, $24$, $24$
• D. $24$, $12$, $24$

Answer 1

Answer: (C)

$12$, $24$, $24$

Answer 2

Chromosome number in male gamete of rice plant is $n = 12$ therefore chromosome number in female gamete would also be $12$. Zygote is diploid as it is the product of fertilisation and the cells of the seedling would be meiocytes and other diploid cells. Hence, the chromosome number in both zygote and cells of seedling will be $2n = 24$.