[Campbell Biology P.1078] According to the provided diagram and text, what is the ploidy leve... | Practice Question

According to the provided diagram and text, what is the ploidy level of a secondary oocyte, and what event is necessary for it to complete meiosis II?

  • A: 2n; completion of meiosis I.
  • B: n; penetration by a sperm.
  • C: 2n; onset of puberty.
  • D: n; rupture of the follicle.

Explanation

The diagram clearly shows 'n' for the secondary oocyte, indicating its haploid state after Meiosis I. The text states: 'Only if a sperm penetrates the oocyte does meiosis II resume.'