a) Haemophilia Sex-linked recessive
b) Downs syndrome Trisomy 21
c) Klinefelter's syndrome Monosomy of sex chromosome
d) Incomplete sex linkage Nephrites
Find the mismatched pair

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Solution

a) Haemophilia Sex-linked recessive disease
b) Down syndrome Trisomy of 21
c) Klinefelter syndrome Presence of an additional copy of X- chromosome (trisomy of sex chromosome)
d) Incomplete sex linkage Not shown by nephrites
So, the correct answer is ' Option C & D '

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\begin{matrix} Disorder & Characteristic feature i . & Haemophilia & Sex linked recessive i i . & Down's syndrome & Trisomy 21 i i i . & Turner's syndrome & Trisomy of sex chromosome i v . & Klinefelter's syndrome & Monosomy of sex chromosome \end{matrix}

	Column I		Column II
A.	Autosomal recessive trait	(i)	Downs syndrome
B.	Sex-linked recessive trait	(ii)	Phenylketonuria
C.	Metabolic error linked to autosomal recessive trait	(iii)	Haemophilia
D.	Additional 21st chromosome	(iv)	Sickle cell anaemia

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

\int \frac{s e c x}{s e c x + t a n x}

(s e c x^{\circ} - t a n x^{\circ}) (s e c x^{\circ} + t a n x^{\circ})

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a)	Haemophilia	Sex-linked recessive disease
b)	Down syndrome	Trisomy of 21
c)	Klinefelter syndrome	Presence of an additional copy of X- chromosome (trisomy of sex chromosome)
d)	Incomplete sex linkage	Not shown by nephrites