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SCORPION-xisa [38]
3 years ago
5

7) This is a type of reproduction where there is a exchange of genetic information in order to create new individuals.

English
1 answer:
sweet [91]3 years ago
8 0

Once this chromosomal condensation has occurred, the members of each chromosome pair (called homologous chromosomes, because they are similar in size and contain similar genes), align next to each other. At this point, the two chromosomes in each pair become tightly associated with each other along their lengths in a process called synapsis. Then, while the homologous chromosomes are tightly paired, the members of each pair trade adjacent bits of DNA in a process called crossing over, also known as recombination (Figure 1). This trading of genetic material creates unique chromosomes that contain new combinations of alleles.

At the end of prophase I, the nuclear membrane finally begins to break down. Outside the nucleus, the spindle grows out from centrosomes on each side of the cell. As in mitosis, the microtubules of the spindle are responsible for moving and arranging the chromosomes during division.

Metaphase I

A schematic shows two pairs of homologous chromosomes arranged in a vertical formation in the middle of a cell. Two developing mitotic spindles flank the four chromosomes. Long fibers radiating from the mitotic spindles are attached to the centromere of each chromosome.

Figure 2: Near the end of metaphase I, the homologous chromosomes align on the metaphase plate.

Figure Detail

At the start of metaphase I, microtubules emerge from the spindle and attach to the kinetochore near the centromere of each chromosome. In particular, microtubules from one side of the spindle attach to one of the chromosomes in each homologous pair, while microtubules from the other side of the spindle attach to the other member of each pair. With the aid of these microtubules, the chromosome pairs then line up along the equator of the cell, termed the metaphase plate (Figure 2).

Anaphase I

A schematic shows each member in a pair of homologous chromosomes separating from its partner and migrating in opposite directions. White spindle fibers attached to the centromeres of each chromosome are responsible for the movement of the chromosomes to opposite poles of the cell.

Figure 3: During anaphase I, the homologous chromosomes are pulled toward opposite poles of the cell.

Figure Detail

During anaphase I, the microtubules disassemble and contract; this, in turn, separates the homologous chromosomes such that the two chromosomes in each pair are pulled toward opposite ends of the cell (Figure 3). This separation means that each of the daughter cells that results from meiosis I will have half the number of chromosomes of the original parent cell after interphase. Also, the sister chromatids in each chromosome still remain connected. As a result, each chromosome maintains its X-shaped structure.

Telophase I

A schematic shows two overlapping, circular cells, each with a nucleus and two chromosomes. The cytoplasmic portions of the cells are light grey, and the nuclei are dark grey. The chromosomes in the left-hand cell are mostly green, but the lower regions of the right chromatids are orange. The chromosomes in the right-hand cell are mostly orange, but the lower regions of the left chromatids are green. Both cells have remnants of the mitotic spindle in the cytoplasm.

Figure 4: Telophase I results in the production of two nonidentical daughter cells, each of which has half the number of chromosomes of the original parent cell.

As the new chromosomes reach the spindle during telophase I, the cytoplasm organizes itself and divides in two. There are now two cells, and each cell contains half the number of chromosomes as the parent cell. In addition, the two daughter cells are not genetically identical to each other because of the recombination that occurred during prophase I (Figure 4).

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Ima try again, write a poem, it can be about anything just please dont plagiarize the poem, also it has to be appropriate for sc
Sphinxa [80]

Answer:

We have a secret, you and I

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Explanation:

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Q.No.10) Write a letter to your father calling him to come back to<br>Nepal from foreign country. ​
notsponge [240]

Dear friend.

I am writing this letter because I woke up missing you so much and I couldn't help but tell you how important you are, not only to me, but to everyone who loves you here in Nepal.

For this reason, I believe it is time for you to return to your land and the people who love you. You've been away for so long, I believe you're missing it too and want to see and live with your people.

Your family is growing, your country is growing and it would be a shame you weren't here to witness it all and live in the culture that is truly yours.

However, I don't want to pressure you into making this decision. I know that everything happens at the right time and at the right and appropriate time you will decide to go home. I hope this happens soon, as I really wanted to see you.

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Why did the mortals fight the trojan war
Reika [66]
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4 0
3 years ago
The noise level from next door was so loud that it was no longer tolerable.
Paul [167]

Answer:

D

Explanation:

The easiest method is to substitute each option in place of tolerated. That being said, C doesn't make sense because it sounds wrong- "it was no longer already tolerated" isn't grammatically correct.  

B doesn't sound right but there's (technically) nothing wrong with the grammar.

Tolerate means you ARE able to accept or endure something. Tolerable is the adjective version of that.

This can be tricky because you may think it's asking for the meaning of the phrase and not the word tolerable. It's only asking for tolerable.

That being said, A and B are the opposite meaning of tolerable- they mean you cannot endure it, which is the opposite.

D is the answer.

8 0
2 years ago
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Answer:

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