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Practice Listening: Multiple Choice, Single Answer ID: #41021 Short Meiosis
Instructions ›
You will see a video about how meiosis functions and its importance in sexual reproduction. Listen to the recording and answer the multiple-choice question by selecting the correct response. Only one response is correct.

Transcript:

In meiosis, the cells chromosomes replicate and form pairs in a process called crossing. Over each pair exchanges chromosomal material to enhance genetic variation. The cell then follows division steps similar to mitosis, to form two daughter cells. These two daughter cells in turn undergo cell division to create a total of four new sex cells. Each with only half the chromosomal makeup. Of the parents. Cell and each with a unique assortment of genetic information. So, when a male sex cell and a female sex cell combined during sexual reproduction, a new cell with the normal number of chromosomes is created. This new cell will divide repeatedly by mitosis until a complete new individual is formed.

What is the primary purpose of crossing over during meiosis as described in the video?

* Listen to the recording and select the correct answer

Result:

AI explanationShows the answer. Tap to open.
Option 2: "To enhance genetic variation among the sex cells produced"

Explanation: This option is correct as the text explicitly mentions that crossing over allows each pair of chromosomes to exchange chromosomal material, thereby enhancing genetic variation. This is the primary purpose of crossing over during meiosis, as it leads to unique combinations of genetic information in the resulting sex cells.

Option 1: "To ensure each daughter cell receives an identical set of chromosomes"

Explanation: This option is incorrect because the text states that crossing over enhances genetic variation, which implies that the daughter cells do not receive identical sets of chromosomes. Instead, they receive unique assortments of genetic information, contradicting the idea of identical sets.

Option 3: "To reduce the number of chromosomes in each daughter cell by half"

Explanation: This option is incorrect because while meiosis does result in daughter cells with half the chromosomal makeup of the parent, the reduction in chromosome number is a result of the overall process of meiosis, not specifically due to crossing over. The text does not attribute this reduction to crossing over.

Option 4: "To increase the number of daughter cells produced from the parent cell"

Explanation: This option is incorrect as the text indicates that meiosis results in four new sex cells from one parent cell, but this increase in the number of daughter cells is not related to crossing over. The purpose of crossing over is specifically to enhance genetic variation, not to increase the quantity of cells.

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