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Down syndrome occurs when an individual has
Option: 1
45 chromosomal number
Option: 2
Nondisjunction of 21st chromosome
Option: 3
23rd chromosome in three doses
Option: 4
47 chromosome number
Answers (1)
As we have already studied in Chromosomal Disorders -
Down’s Syndrome:
- It occurs due to the additional copy of chromosome number 21 or trisomy of chromosome 21 in humans and also seen in chimpanzees and other related primates.
- Hence, the correct option is (b).
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