topic: meiosis activity 1 the diagrams below represent two different phases of meiosis in an organism. diagram i (with a and c labeled) diagram ii 2.1.1 identify: (a) a ________ (b) b ________ 2.1.2 identify the phases represented by: (a) diagram i ________ (b) diagram ii ________ 2.1.3 state the number of chromosomes that were present in the original cell at the start of meiosis. ________ 2.1.4 give the name of the organ in a male where meiosis occurs. ________

Question

Accepted Answer

### 2.1.1 (a)
# Brief Explanations:
In meiosis diagrams, structure A (usually the chromosome or chromatid - related structure, here likely a chromosome or a pair? Wait, in meiosis, during stages like metaphase I or II, the structures on the spindle. Wait, Diagram I: if it's a cell with chromosomes aligned, A is likely a chromosome (or a chromatid? Wait, no, in meiosis, at metaphase I, homologous chromosomes align, at metaphase II, sister chromatids. Wait, but the diagram: Diagram I has chromosomes (maybe homologous) aligned? Wait, A is a chromosome (or a pair? Wait, no, the label A is on a structure. Wait, in meiosis, the main structures: chromosomes, spindle fibers, centrioles (or centrosomes). Wait, A is likely a chromosome (since it's the genetic material structure). So A is a chromosome (or a pair? Wait, no, in the diagram, if it's metaphase I, A could be a homologous chromosome pair, but maybe a chromosome (sister chromatids? Wait, no, in meiosis, during prophase I, crossing over, metaphase I: homologous chromosomes at equator. Metaphase II: sister chromatids. Wait, Diagram I: let's think. In meiosis, the first diagram (Diagram I) – maybe metaphase I? Then A is a chromosome (homologous pair? No, maybe a chromosome with sister chromatids). Wait, the standard meiosis diagrams: A is a chromosome (composed of two sister chromatids in early stages). So A is a chromosome (or a chromatid? Wait, no, chromosome is the structure with DNA. So (a) A is a chromosome (or sister chromatid? Wait, no, in the diagram, if it's a cell in meiosis, A is a chromosome (maybe a bivalent? No, maybe a chromosome). So the answer is chromosome (or more precisely, a chromosome with sister chromatids, but in basic terms, chromosome).

# Answer:
A is a chromosome (or a pair? Wait, no, in the diagram, likely a chromosome (composed of two sister chromatids)

### 2.1.1 (b)
# Brief Explanations:
In meiosis diagrams, B (looking at the diagram, maybe the spindle fiber? Wait, the diagram has B as a structure, maybe the spindle fiber (the fibers attaching to chromosomes). So B is a spindle fiber (or spindle apparatus structure).

# Answer:
B is a spindle fiber (or spindle microtubule)

### 2.1.2 (a)
# Brief Explanations:
Diagram I: chromosomes (maybe homologous) aligned at the equator, with spindle fibers attached. If it's meiosis, metaphase I (if homologous chromosomes) or metaphase II (if sister chromatids). Wait, but in Diagram I, if the chromosomes are in pairs (homologous), then it's metaphase I. But maybe Diagram I is metaphase II? Wait, no, let's recall: meiosis I has homologous chromosomes, meiosis II has sister chromatids. Wait, the first diagram (Diagram I) – if the chromosomes are aligned at the equator with each chromosome having two chromatids, it could be metaphase I (meiosis I) or metaphase II (meiosis II). Wait, but in Diagram II, maybe anaphase? Wait, no, 2.1.2 (a) Diagram I: let's think of typical meiosis stages. Metaphase I: homologous chromosomes at equator. Metaphase II: sister chromatids at equator. If Diagram I has chromosomes with two chromatids (so before separation), maybe metaphase I. But maybe it's metaphase II? Wait, no, the key is: in meiosis, the first division (meiosis I) separates homologous chromosomes, second (meiosis II) separates sister chromatids. So Diagram I: if the chromosomes are aligned at the equator, and each chromosome has two chromatids, it's metaphase I (meiosis I) or metaphase II (meiosis II). Wait, maybe the diagram shows metaphase I (meiosis I) for Diagram I. Alternatively, maybe prophase? No, aligned at equator is metaphase. So Diagram I is metaphase I (Meiosis I) or metaphase II (Meiosis II). Wait, maybe the answer is Metaphase I (Meiosis I) or Metaphase II (Meiosis II). Wait, let's check the other diagram (Diagram II): if Diagram II has chromosomes moving, maybe anaphase. But for Diagram I: the chromosomes are aligned at the equator, so metaphase (either I or II). But in the original cell, if it's meiosis, the first diagram (Diagram I) – maybe metaphase I (meiosis I) because the chromosomes are in pairs? Wait, no, maybe not. Alternatively, maybe Diagram I is metaphase II. Wait, this is confusing. But the standard answer for such diagrams: Diagram I is Metaphase I (Meiosis I) or Metaphase II (Meiosis II). Wait, maybe the answer is Metaphase I (Meiosis I) (if homologous chromosomes) or Metaphase II (Meiosis II) (if sister chromatids). But let's assume that Diagram I is Metaphase I (Meiosis I) (because the chromosomes are in a way that suggests homologous pairs).

# Answer:
Diagram I represents Metaphase I (of Meiosis I) (or Metaphase II, but more likely Metaphase I if chromosomes are homologous)

### 2.1.2 (b)
# Brief Explanations:
Diagram II: chromosomes are moving towards the poles, with sister chromatids separating? Wait, no, in meiosis, anaphase I separates homologous chromosomes, anaphase II separates sister chromatids. If Diagram II has chromosomes with single chromatids (after separation), it's anaphase II. Or if with two chromatids, anaphase I. Wait, the diagram: if the chromosomes are moving, and each chromosome has one chromatid (after separation), then it's anaphase II (Meiosis II). Or if two chromatids, anaphase I (Meiosis I). So Diagram II is likely Anaphase II (Meiosis II) or Anaphase I (Meiosis I). But let's see: in Diagram II, the chromosomes are moving, so anaphase. So the phase is Anaphase I (Meiosis I) or Anaphase II (Meiosis II).

# Answer:
Diagram II represents Anaphase I (Meiosis I) or Anaphase II (Meiosis II) (more likely Anaphase II if sister chromatids are separating)

### 2.1.3
# Brief Explanations:
In meiosis, the number of chromosomes in the original cell (parent cell) is the diploid number. When meiosis starts, the cell is diploid (2n). After meiosis, it's haploid (n). But the question is: State the number of chromosomes that were present in the original cell at the start of meiosis. Wait, looking at the diagrams: if in Diagram I, the number of chromosomes (visible) – let's say in Diagram I, there are, for example, 2 chromosomes (but maybe 4? Wait, no, the diagram: if A is a chromosome, and in Diagram I, how many A - like structures? Wait, maybe the original cell had 4 chromosomes (diploid, 2n = 4). Wait, in meiosis, if the daughter cells will have half, so original cell has 4 (if the diagrams show 2 in a cell, but maybe not). Wait, the standard example: if in meiosis, the original cell (germ cell) has 4 chromosomes (2n = 4), then after meiosis, each gamete has 2 (n = 2). But the question is about the original cell. So the number of chromosomes in the original cell at the start of meiosis is the diploid number. If, for example, in the diagrams, the cells have 2 chromosomes (but that's haploid? No, wait, no. Wait, maybe the original cell had 4 chromosomes (2n = 4). So the answer is 4 (if the diagrams are of a cell with 2 chromosomes in metaphase, but that would be n = 2, so original cell 2n = 4).

# Answer:
The number of chromosomes in the original cell at the start of meiosis is 4 (assuming the cell in the diagram has 2 chromosomes, so 2n = 4)

### 2.1.4
# Brief Explanations:
In males, meiosis occurs in the testes (specifically in the seminiferous tubules of the testes, producing sperm cells). So the organ is the testis (testes).

# Answer:
The organ in a male where meiosis occurs is the testis (testes)

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QUESTION IMAGE

Question

Explanation:

2.1.1 (a)

Answer:

2.1.1 (b)