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Question

The diagram represents the chromosomes of a person with a genetic disorder caused by non disjunction in which the chromosomes fail to separate properly. Which chromosome set display non-disjunction? What is the syndrome?
383710.JPG
  1. Chromosome set 23; Klinefelter's syndrome
  2. Chromosome set 23; Turner's syndrome
  3. Chromosome set 21; Klinefelter's syndrome
  4. Chromosome set 21; Down's syndrome

A
Chromosome set 21; Klinefelter's syndrome
B
Chromosome set 23; Turner's syndrome
C
Chromosome set 23; Klinefelter's syndrome
D
Chromosome set 21; Down's syndrome
Solution
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In the diagram given above, we can clearly see three copies of chromosome 21. Disorder related to this is known as Down syndrome, that causes developmental and intellectual delays.
Down syndrome occurs when an individual has a full or partial extra copy of chromosome 21. Common physical traits are low muscle tone, small stature, an upward slant to the eyes, and a single deep crease across the centre of the palm. Each individual with Down syndrome is a unique individual and may possess these characteristics to different degrees.
Down syndrome is usually caused by an error in cell division called non-disjunction. It results in an embryo with three copies of chromosome 21 instead of the usual two.

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Similar Questions
Q1
The diagram represents the chromosomes of a person with a genetic disorder caused by non disjunction in which the chromosomes fail to separate properly. Which chromosome set display non-disjunction? What is the syndrome?
383710.JPG
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Q2
Match the chromosomal disorders given in column I with that of their total chromosome numbers in column II.
Column I Column II
i. Turner syndrome p. 45A +XX
ii. Super female q. 44A + XXY
iii. Klinefelter syndrome r. 44A + XXX
iv. Down syndrome s. 44A + XO

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Q3

Mark the odd one w.r.t to syndrome which occur due to failure of segregation of homologous pair of chromosomes during cell division cycle

A) klinefelter syndrome

B) down syndrome

C) turner syndrome

D) thalassemia

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Q4

Assertion [A]: Klinefelter syndrome occurs only in males.

Reason [R]: Klinefelter syndrome is characterised by an additional Y chromosome in the karyotype.


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Q5
Three copies of chromosome 21 in a child with Downs syndrome have been analysed using molecular biology technology to detect any possible DNA polymorphism with reference to different alleles located on chromosome - 21. Results showed that out of three copies two of the chromosomes of the child contain the same alleles as one of the mother's alleles. Based on this when did the non-disjunction event most likely occur?
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