Which of the following is an X linked disorder in human beings? a) Hemophilia b)

Question

Which of the following is an X linked disorder in human beings? a) Hemophilia b) Color blindness c) HIV d) Hemopilia and Color blindness e) all of these A color bind male mates with woman who has normal vision. The woman has no history of colorblindness in her family. What percentage of their sons are expected to be colorblind? a) 25% b) 50% c) 75% d) 100% e) 0% A(n) ____ gene has a locus on both the X-and Y chromosome a) Autosomal b) Psedoautosomal c) X-linked d) Y-linked e) None of these In humans the Y chromosome carries ____ genes than the X chromosome a) fewer b) More c) Similar d) all of these e) None of these Sexual dimorphism can be determined by: a) The environment b) Temperature c) Genetic factors d) All of these In humans an individual who is genotype as XO is a: a) Male b) Female c) Hermaphrodite d) None of these e) All of these Which of the following is the part of the Y chromosome that is critical for normal male development? a)

Explanation / Answer

Answers are as follows :-

30 - according to me , the correct option is D , hemophila and red green color blindness because both are X-linked recessive disorders .

Red-green color blindness. Red-green color blindness means that a person cannot distinguish shades of red and green (usually blue-green), but their ability to see is normal. There are no serious complications; however, those affected may not be considered for certain occupations involving transportation or the Armed Forces where color recognition is required. Males are affected more often than females, because the gene is located on the X chromosome.

Hemophilia A. Hemophilia A is a disorder where the blood cannot clot properly due to a deficiency of a clotting factor called Factor VIII. This results in abnormally heavy bleeding that will not stop, even from a small cut. People with hemophilia A bruise easily and can have internal bleeding into their joints and muscles.

31 . mother's genotype - XNXN

father's genotype (color blind) - XnY

Xn Y

XN   XNXn   XNY

XN   XNXn    XNY

From the Punnett square it is obvious that half of the children will be color blind and the other half will be normal .

XNXn - normal girl

XNY - color blind male

The probability that their son is color blind is 50% . option (b)

32 . the correct option is (b) pseudoautosomal

because The pseudoautosomal regions are homologous sequences of nucleotides on the X and Y chromosomes .

33 . The correct option is A ,

because The X chromosome, being larger, carries many more genes than does the Y. Traits controlled by genes found only on the X chromosome are said to be sex-linked .

34 . the correct option is D .

it is determined by all the three factors .

35 . the correct option is B i.e. female .

because  All XO individuals arefemales with Turner's syndrome. Individuals with only a Y chromosome do not survive .

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