Mention the chromosomal abnormalities concerned with the following conditions in humans.
(i) Turner's syndrome
(ii) Klinefelter's Syndrome
(iii) Down's Syndrome

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Solution

(i) In Turner's syndrome (45X) is characterized by the monosomy ( partial or complete loss) of one of the X chromosome. It is mostly noticed in females.
(ii) In Klinefelter's syndrome, (47XXY or XXY) is characterized by the presence of two or more X chromosomes in males.
(iii) In Down's syndrome, is characterized by the trisomy at chromosome 21, which means the presence of an extra (third) copy of chromosome 21. It is represented by 47, XX+21 (female) and 47,XY+21 (male).

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Similar questions

	List I - Syndrome		List II - Chromosomal abnormalities
A	Klinefelter syndrome	p	Trisomy 13
B	Turner's syndrome	q	Trisomy 18
C	Super female	r	44+XXY
D	Patau's syndrome	s	44+XXX
		t	44+XO

\begin{matrix} Syndrome name & Chromosome Affected & Incidence per 10,000 births & Type of mutation Polyploidy & Extra complete set of chromosomes & Fatal, doesn't reach full term & Addition Patau syndrome & 13 & 2 & Addition Edwardsn syndrome & 18 & 3 & Addition Down syndrome & 21 & 15 & Addition Klinefelter syndrome & 23 & 10(affects only males)) & Addition Turner Syndrome & 23 & 2(affects only females)) & Deletion \end{matrix}

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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