The diagrams below represent two phases of meiosis - NSC Life Sciences - Question 3 - 2020 - Paper 1
Question 3
The diagrams below represent two phases of meiosis.
Identify part A.
Identify the phase represented by diagram 1.
Describe the events that took place in the phase ... show full transcript
Worked Solution & Example Answer:The diagrams below represent two phases of meiosis - NSC Life Sciences - Question 3 - 2020 - Paper 1
Step 1
Identify part A.
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Answer
Part A is the centrioles (or centrosomes), which are involved in the organization of the spindle fibers during cell division.
Step 2
Identify the phase represented by diagram 1.
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Answer
The phase represented by diagram 1 is Anaphase.
Step 3
Describe the events that took place in the phase before the one represented in diagram 2.
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Answer
In the phase before diagram 2, which is Metaphase, the spindle fibers attach to the centromeres of the chromosomes. The chromosomes align at the cell's equatorial plane, ensuring accurate separation during Anaphase.
Step 4
Name the process that causes the chromosomes to have a combination of genes as shown in the diagrams.
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Answer
The process that causes the chromosomes to have a combination of genes is called Crossing Over.
Step 5
Give ONE reason why the process named in QUESTION 3.1.4 is important.
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Crossing Over is important because it leads to genetic variation, which is crucial for evolution and adaptation of species.
Step 6
If this was a human cell, how many chromosomes would be present in the cell during the phase represented in diagram 1?
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In a human cell during this phase, there would be 46 chromosomes present, or 23 pairs.
Step 7
Explain why they are structurally different.
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Structure B contains two DNA molecules, consisting of double strands. In contrast, Structure C consists of a single thread or chromatid, which is unreplicated. This difference arises because Structure B is formed during DNA replication, while Structure C appears during Anaphase when the chromatids are split apart.
