객관식
Which of the following steps is seen in meiosis but not in mitosis?
153
views
12. Meiosis
Meiosis I
객관식
During Meiosis I in oogenesis, the primary oocyte divides to form a secondary oocyte and which of the following?
A
A polar body
B
An ovum
C
A spermatid
D
A zygote
검증된 단계별 안내1
Understand the process of oogenesis: Oogenesis is the process by which female gametes (eggs) are produced in the ovaries. It involves meiosis, a type of cell division that reduces the chromosome number by half.
Recall the stages of meiosis: Meiosis consists of two divisions, Meiosis I and Meiosis II. During Meiosis I, homologous chromosomes are separated, and the cell divides into two haploid cells.
Focus on Meiosis I in oogenesis: In oogenesis, the primary oocyte (a diploid cell) undergoes Meiosis I to produce two haploid cells. However, the division is unequal, resulting in one large cell (the secondary oocyte) and one very small cell.
Identify the smaller cell: The smaller cell formed during Meiosis I is called a polar body. It contains very little cytoplasm and is typically not functional in reproduction.
Conclude the answer: The secondary oocyte and the polar body are the two products of Meiosis I in oogenesis. The polar body is a byproduct of the unequal division and ensures that the secondary oocyte retains most of the cytoplasm.
관련 영상
관련 실천
