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Ivan
3 years ago
8

Rachael is observing a few slides taken from a female orangutan. She observes an ovarian slide where all the cells show chromoso

me tetrads in synapses.
Which stage of meiosis has Rachael observed?

Meiotic prophase I
Meiotic prophase II
Meiotic metaphase I
Biology
2 answers:
s344n2d4d5 [400]3 years ago
7 0

The correct answer is:

Meiotic prophase I

Explanation:

The cause that it is Prophase 1 is that the stage shows the chromosomes spanning close to cross over genetic information before they are solidified into the center of the cell to split, which is the stage of Metaphase 1.Synapses just shows that homologous pairs connecting with each other. This could only suggest that they are crossing over which issues in Prophase 1. Also, in Prophase II when the cell has beforehand divided it would no longer be in tetrad form. Metaphase is when the homologous pairs get pulled aside.


vesna_86 [32]3 years ago
3 0
"Meiotic prophase I" is the one stage of meiosis among the following choices given in the question that <span>Rachael has observed. The correct option among all the options that are given in the question is the first option. I hope that this is the answer that you were looking for and it has come to your desired help.</span>
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Is the temperature profile in the thermosphere more like that of the troposphere or the stratosphere?
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The correct answer is: stratosphere.

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In 3-5 sentences how are viruses,prokarya , and eukaryotic cells different (include the words:cell,living,size,disease,animal,an
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Components of Prokaryotic Cells

All cells share four common components: 1) a plasma membrane, an outer covering that separates the cell’s interior from its surrounding environment; 2) cytoplasm, consisting of a jelly-like region within the cell in which other cellular components are found; 3) DNA, the genetic material of the cell; and 4) ribosomes, particles that synthesize proteins. However, prokaryotes differ from eukaryotic cells in several ways.

A prokaryotic cell is a simple, single-celled (unicellular) organism that lacks a nucleus, or any other membrane-bound organelle. We will shortly come to see that this is significantly different in eukaryotes. Prokaryotic DNA is found in the central part of the cell: a darkened region called the nucleoid.

 

In this illustration, the prokaryotic cell has an oval shape. The circular chromosome is concentrated in a region called the nucleoid. The fluid inside the cell is called the cytoplasm. Ribosomes, depicted as small circles, float in the cytoplasm. The cytoplasm is encased in a plasma membrane, which in turn is encased by a cell wall. A capsule surrounds the cell wall. The bacterium depicted has a flagellum protruding from one narrow end. Pili are small protrusions that extend from the capsule in all directions.

Figure 3.6 This figure shows the generalized structure of a prokaryotic cell.

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Eukaryotic Cells

In nature, the relationship between form and function is apparent at all levels, including the level of the cell, and this will become clear as we explore eukaryotic cells. The principle “form follows function” is found in many contexts. For example, birds and fish have streamlined bodies that allow them to move quickly through the medium in which they live, be it air or water. It means that, in general, one can deduce the function of a structure by looking at its form, because the two are matched.

A eukaryotic cell is a cell that has a membrane-bound nucleus and other membrane-bound compartments or sacs, called organelles, which have specialized functions. The word eukaryotic means “true kernel” or “true nucleus,” alluding to the presence of the membrane-bound nucleus in these cells. The word “organelle” means “little organ,” and, as already mentioned, organelles have specialized cellular functions, just as the organs of your body have specialized functions.

Cell Size

At 0.1–5.0 µm in diameter, prokaryotic cells are significantly smaller than eukaryotic cells, which have diameters ranging from 10–100 µm (Figure 3.7). The small size of prokaryotes allows ions and organic molecules that enter them to quickly spread to other parts of the cell. Similarly, any wastes produced within a prokaryotic cell can quickly move out. However, larger eukaryotic cells have evolved different structural adaptations to enhance cellular transport. Indeed, the large size of these cells would not be possible without these adaptations. In general, cell size is limited because volume increases much more quickly than does cell surface area. As a cell becomes larger, it becomes more and more difficult for the cell to acquire sufficient materials to support the processes inside the cell, because the relative size of the surface area across which materials must be transported declines.

 

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