Sprint LTE Done genetic crosses. 10:27 AM Attachment MITOSIS Cells replicate the

Question

Sprint LTE Done genetic crosses. 10:27 AM Attachment MITOSIS Cells replicate themselves by dividing. Before this can happen, the DNA in the cell nucleus must be copied, and partitioned equally into two groups, one of which will end up in each daughterel. This replication precedes the actual splitting of the nucleus, mitosis, which is commonly described as occurring in five phases: Prophase- the chromosomes condense (tighten their structure), nuclear envelope breaks down Prometaphase- the chromosomes are in process of moving to the equator Metaphase- the c Anaphase- the chromosomes pull apart Telophase- the chromosomes cluster at opposite poles, nuclear envelopes re-form around both sets are grouped at the equator Cells generally spend less time in mitosis than in other stages of their cycle, so most of the cells in a given specimen viewed under a microscope will not be in any of the five phases of mitosis. However, some samples will have a relatively elevated number- for instance, the tip of an onion root, because it is actively growing, will have more cells in the process of division at any moment than will be found in most other plant tissue. The cells numbered 1-4 below, in this microscope image of onion meristem cells, are examples of prophase, metaphase, anaphase, and telophase. In the spaces below, label which is which. Photo by Josef Reischig, via Wikimedia Czech Republic's GLAM initiative Cell 1 Cell 3 Cell 2 Cell 4

Explanation / Answer

Answer:1. Mitosis:
a. Cell 1: Here, the cell is in the prophase. It is the first step in the mitosis which is evident by the presence of chromosome condensation. In the picture as well you can clearly see the condensation of the chromosome in the dark blue color.
b. Cell 2: Here, the cell is in the metaphase which is the second stage of mitosis. In this stage, chromosome arranges in the same axis i.e. in the midline of the cell where chromosome attaches to the spindle fibers via its centromere. In the picture, you can clearly see the chromosomes aligned in the middle of the cell dark blue colored body.
c. Cell 3: Here, the cell is in the telophase stage. Now in this stage, the existing chromosome divides to form the two nuclei. Also, the chromosome starts to decondense and nuclear membrane and nucleolus start to reappear again. As you can see from the picture the dividing nuclei are clearly visible which are dark blue in color and separated into two nuclei.
d. Cell 4: Here, the cell is in the anaphase stage. In this stage, the chromatids move apart from each other in the opposite pole of the cells. As you can see in the picture the chromatids which are stained in the dark blue color appears at the opposite poles in the cells.

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