Down's syndrome occurs in the $21^{st}$ pair of chromosomes due to the presence of an additional chromosome.
- A$22^{nd}$
- B$21^{st}$
- C$7^{th}$
- D$23^{rd}$
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The arrangement of chromosomes in the order of decreasing length is termed as:
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View SolutionFind out the correct pair.
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View SolutionChoose the correct answer regarding the following statements:
$(i)$ Sickle-cell anaemia is controlled by three pairs of alleles.
$(ii)$ Trisomy is a chromosomal disorder.
$(iii)$ $47$ chromosomes are present in a person having Turner's syndrome.
$(i)$ Sickle-cell anaemia is controlled by three pairs of alleles.
$(ii)$ Trisomy is a chromosomal disorder.
$(iii)$ $47$ chromosomes are present in a person having Turner's syndrome.
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View SolutionWhat is the sex chromosome complement in a male child with Down syndrome?
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