OBJECTIVE LIFE SCIENCE
GENETICS
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Which of the following best explains why the chromosome number is an even number in organisms?
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It is only by coincidence, many organisms have an odd number
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It isn’t, I don’t know who told you that, but they were lying.
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The number of chromosomes in a none sex cell represents pairs of chromosomes, half from each parent so the number MUST be even.
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Chromosomes double every time the cell divides, so after the first division, the number is always even
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Explanation:
Detailed explanation-1: -Because the chromosome number of a species remains the same from one generation to the next, the chromosome number of germ cells must be reduced by half during meiosis. To accomplish this feat, meiosis, unlike mitosis, involves a single round of DNA replication followed by two rounds of cell division (Figure 1).
Detailed explanation-2: -If the individual has an even number of chromosome sets, they are usually fertile. This is because the chromosomes can still pair up during meiosis and produce functional gametes.
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