Question

In frog chromosome number is reduced to half

• A. When $2$${}^{nd}$ polar body is separated
• B. When $2$${}^{nd}$ polar body is divided
• C. When $3$${}^{rd}$ polar body is separated
• D. When $1$${}^{st}$ polar body is separated

Answer 1

Answer: (D)

When $1$${}^{st}$ polar body is separated

In the process of oogenesis during meiosis-I, the diploid primary oocyte divides into two unequal haploid daughter cells known as the secondary oocyte and the first polar body. During meiosis-I, the number of chromosomes is first reduced to half, hence it is called reductional division.
Thus, the correct answer is option D.