GK
BIOLOGY
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Number of chromosomes in Down’s syndrome is
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46
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47
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48
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49
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Explanation:
Detailed explanation-1: -In most cases of Down syndrome, a child gets an extra chromosome 21-for a total of 47 chromosomes instead of 46. Rarely, the extra chromosome 21 attaches to another chromosome. This extra genetic material causes the physical features and developmental delays in people with Down syndrome.
Detailed explanation-2: -Monosomy means that a person is missing one chromosome in the pair. Instead of 46 chromosomes, the person has only 45 chromosomes. This means a girl with TS has only one X chromosome in her 23 rd pair. Sometimes an error occurs when an egg or sperm cell is forming.
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