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In which stage of Meiosis II does the nuclear envelope once again enclose the groups of chromosomes?
The NCERT states, 'Telophase II: Meiosis ends with telophase II, in which the two groups of chromosomes once again get enclosed by a nuclear envelope.'
A cell undergoing meiosis has a chromosome number of $2n=4$ after Meiosis I. What will be the number of chromosomes ($n$) and the amount of DNA ($C$) in a daughter cell at the end of Meiosis II?
After Meiosis I, each cell is haploid but with duplicated chromosomes, so it's $n=2$ (since the parent was $2n=4$) and $2C$ DNA content. Meiosis II is equational, similar to mitosis; sister chromatids separate, reducing DNA content by half but maintaining the haploid chromosome number. Thus, for each newly formed cell, $n=2$ and $C=C$ (where $C$ is the DNA content of a haploid cell before S phase).
Which of the following is NOT an event of Meiosis II?
The NCERT mentions that 'recombination between non-sister chromatids of homologous chromosomes' occurs in Meiosis I (specifically Prophase I). Meiosis II does not involve crossing over.
Cytokinesis typically follows Telophase II, resulting in the formation of a:
The NCERT text states, 'Cytokinesis follows resulting in the formation of tetrad of cells i.e., four haploid daughter cells'.
Consider a cell with $2n = 6$ chromosomes. After Meiosis I, each cell will have:
In Meiosis I, homologous chromosomes separate, reducing the chromosome number by half. So, from $2n=6$, each cell after Meiosis I will have $n=3$ chromosomes. These chromosomes are still replicated, meaning each consists of two sister chromatids. Thus, 3 chromosomes, each with two chromatids.
Which phase of meiosis II involves the alignment of chromosomes at the equatorial plate?
Similar to Metaphase in mitosis, chromosomes align at the equatorial plate during Metaphase II in meiosis. Although not explicitly detailed for Metaphase II, the similarity to mitosis implies this alignment as a characteristic event.
DNA replication occurs:
The NCERT states, 'Meiosis involves two sequential cycles of nuclear and cell division called meiosis I and meiosis II but only a single cycle of DNA replication.' and 'Meiosis I is initiated after the parental chromosomes have replicated to produce identical sister chromatids at the S phase.'
The primary outcome of Meiosis II is to:
Meiosis I reduces the chromosome number. Meiosis II, being similar to mitosis, separates sister chromatids. Since the cells entering Meiosis II are already haploid (with duplicated chromosomes), separating the sister chromatids results in truly haploid cells with unduplicated chromosomes. Crossing over occurs in Meiosis I.
If a plant's sporophyte generation has $2n = 20$ chromosomes, how many chromosomes will be present in each cell after Meiosis II?
Meiosis reduces the chromosome number by half. If the diploid sporophyte has $2n=20$ chromosomes, the haploid cells produced after Meiosis II will each have $n=10$ chromosomes.
Which of the following phases of Meiosis II is characterized by the disappearance of the nuclear membrane and nucleolus?
While not explicitly detailed for Meiosis II, similar to Prophase I and mitotic prophase, the nuclear membrane and nucleolus disappear during Prophase II to allow for spindle fiber formation and chromosome movement.
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