Question

Which of the following is the correct set of ploidy and cell type?

• A. Primary oocyte: Diploid; Secondary oocyte: Haploid; Ovum: Haploid
• B. Primary oocyte: Haploid; Secondary oocyte: Haploid; Ovum: Haploid
• C. Oogonium: Diploid; Primary oocyte: Diploid; Secondary oocyte: Diploid
• D. Oogonium: Diploid; Primary oocyte: Haploid; Secondary oocyte: Haploid

Answer 1

Answer:

A. Primary oocyte: Diploid; Secondary oocyte: Haploid; Ovum: Haploid

The diploid oogonium goes through the first round of meiosis to form primary oocyte, which is arrested at Prophase I. Thus, the primary oocyte is also diploid. The division is completed after the formation of the secondary oocyte, which is haploid. The secondary oocyte undergoes another round of meiosis to form haploid ovum.