Question

shurrie meiosis and genetics
number correct:13 number incorrect: 7
what is shown to the right?
a. prophase ii
b. telophase i
c. metaphase ii
d. anaphase ii and cytokinesis
replay!
click to choose your answer below:

Explanation:

To determine the phase, we analyze each option:

• Option A (Prophase II): In Prophase II, the nuclear envelope breaks down, and chromosomes condense. The image shows a nuclear envelope around the chromosomes, so this is not Prophase II.
• Option B (Telophase I): Telophase I involves the formation of two cells with a haploid number of chromosomes (each with two chromatids), and the nuclear envelope reforms. But in Telophase I, the cells are still in the process of separating, and the chromosomes here appear to be single - chromatid? No, wait, actually, in the image, we see two cells with a single chromosome (with two chromatids? Wait, no, the chromosomes shown have a single structure with two chromatids? Wait, no, let's re - evaluate. Wait, Prophase II: after Telophase I and Cytokinesis, the cells enter Prophase II. But in the image, the cells have a nuclear envelope, and the chromosomes are condensed. Wait, maybe I made a mistake. Wait, let's look at the options again.
• Option C (Metaphase II): Metaphase II is when chromosomes line up at the equator of the cell. The image does not show chromosomes at the equator.
• Option D (Anaphase II and Cytokinesis): Anaphase II is when sister chromatids separate, and Cytokinesis is the division of the cytoplasm. The image does not show chromatids separating.

Wait, maybe I messed up. Let's re - think about Prophase II. After Telophase I, the two cells (with a haploid number of chromosomes, each chromosome has two chromatids) enter Prophase II. In Prophase II, the nuclear envelope breaks down, but in some cases, maybe the initial stage? Wait, no, the image shows two cells with a nuclear envelope around the chromosomes, and the chromosomes are condensed. Let's check the options again.

Wait, the correct answer is A? No, wait, maybe I was wrong. Wait, let's recall the stages of meiosis.

Prophase II: The nuclear envelope breaks down, and the spindle apparatus forms. But in the image, there is a nuclear envelope. Wait, maybe the image is showing Prophase II where the nuclear envelope is still present? No, that's not typical. Wait, maybe the answer is A. Wait, no, let's check the other options.

Wait, Telophase I: In Telophase I, the cell is dividing into two, and the nuclear envelope reforms around the chromosomes (which are still composed of two chromatids). But in Telophase I, the two cells are still connected? No, the image shows two separate cells. Wait, maybe the answer is A. Prophase II: after Telophase I and Cytokinesis, the two haploid cells enter Prophase II. In Prophase II, the chromosomes condense, and the nuclear envelope may start to break down, but in the image, maybe it's the early Prophase II where the nuclear envelope is still present.

Alternatively, maybe I made a mistake. Let's check the options again. The correct answer is A. Prophase II.

Answer:

A. Prophase II