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Standard XII

Biology

What is Pleiotropy?

Haemophilia i...

Question

Haemophilia is due to

Factor-VII

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Factor-IX

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Factor-VI

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Factor-VIII

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Solution

The correct option is D
Factor-VIII

Haemophilia is a sex-linked trait caused by a recessive gene located in the X-chromosome. This gene controls the synthesis of a coagulation protein called factor VIII needed for clotting of blood.

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Similar questions

Q. Find the H.C.F of the following numbers using prime factorization method:

(i) 144,198
(ii) 81,117
(iii) 84,98
(iv) 225,450
(v) 170, 238
(vi) 504, 980
(vii) 150, 140, 210
(viii) 84, 120, 138
(ix) 106, 159, 265

Q. Find the square root of the following numbers by the factorization method:
(i)

729

(ii)

400

(iii)

1764

(iv)

4096

(v)

7744

(vi)

9604

(vii)

5929

(viii)

9216

(ix)

529

(x)

8100

Q. Write the simplest rationalization factor of the following surds:

(i)

\sqrt{32}

(ii)

\sqrt{x^{3} y^{5}}

(iii)

2 \sqrt{2}

(iv)

\frac{3}{5} \sqrt{10}

(v) 3

\sqrt{72}

(vi) 2

\sqrt[3]{5}

(vii) 4

\sqrt[3]{3}

(viii)

\sqrt[4]{7}

(ix)

4 \sqrt[5]{9}

(x)

\sqrt[5]{a^{2} b^{3} c^{4}}

Q. Functions of plant growth promoters and plant growth inhibitors are given here in a jumbled up manner. Select the option that torrettly segregates these functions.

(i)	Cell division	(ii)	Cell enlargement
(iii)	Pattern formation	(iv)	Tropic growth
(v)	Flowering	(vi)	Fruiting
(vii)	Seed germination	(viii)	Response to wounding
(ix)	Response to stresses of biotic and abiotic origin	(x)	Dormancy

	Functions of growth promoters	Functions of growth inhibitors
(a)	(i), (ii), (vii), (ix)	(iii), (iv), (v), (vi), (viii), (x)
(b)	(viii), (ix), (x)	(i), (ii), (iii), (iv), (v), (vi), (vii)
(c)	(i), (ii), (iii), (iv), (v), (vi), (vii)	(viii), (ix), (x)
(d)	(i), (ii), (iii), (iv), (v), (vi), (vii), (ix), (x)	(viii)

Q. What will happen if the gene for production of factor VIII and IX becomes recessive?

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Haemophilia is due to

The correct option is D Factor-VIII Haemophilia is a sex-linked trait caused by a recessive gene located in the X-chromosome. This gene controls the synthesis of a coagulation protein called factor VIII needed for clotting of blood.

The correct option is D
Factor-VIII

Haemophilia is a sex-linked trait caused by a recessive gene located in the X-chromosome. This gene controls the synthesis of a coagulation protein called factor VIII needed for clotting of blood.