Multiple Choice
Which of the following correctly describes the sequence of events in Meiosis I?
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12. Meiosis
Meiosis I
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Which is a difference between Meiosis I and Meiosis II?
A
Meiosis I results in four haploid cells, while Meiosis II results in two diploid cells.
B
Homologous chromosomes separate during Meiosis I, while sister chromatids separate during Meiosis II.
C
Crossing over occurs during Meiosis II, but not during Meiosis I.
D
DNA replication occurs before Meiosis II, but not before Meiosis I.
Verified step by step guidance1
Understand the basic purpose of meiosis: Meiosis is a type of cell division that reduces the chromosome number by half, resulting in the production of gametes or spores. It consists of two stages: Meiosis I and Meiosis II.
Identify the key events in Meiosis I: During Meiosis I, homologous chromosomes pair up and exchange genetic material through a process called crossing over. This stage ends with the separation of homologous chromosomes into two different cells.
Identify the key events in Meiosis II: Meiosis II resembles mitosis, where the sister chromatids of each chromosome are separated into different cells. This results in four haploid cells from the two cells produced in Meiosis I.
Clarify the concept of homologous chromosomes and sister chromatids: Homologous chromosomes are pairs of chromosomes containing the same genes but possibly different alleles. Sister chromatids are identical copies of a single chromosome, connected by a centromere.
Differentiate between the separation processes: In Meiosis I, homologous chromosomes are separated, while in Meiosis II, sister chromatids are separated. This is a fundamental difference between the two stages.
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