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konstantin123 [22]
3 years ago
15

Two examples of X-linked inheritance in humans are: type II diabetes and high blood pressure. a. sickle-cell anemia and alpha-1-

antitrypsin deficiency. b. red-green color blindness and hemophilia. c. blue eyes and red hair. d. None of the answer options is correct.
Biology
1 answer:
Damm [24]3 years ago
5 0

Answer:

b. red-green color blindness and hemophilia.

Explanation:

Two types of gene determine sex of  human. The X-chromosome and the Y -chromosomes.They  are known as heterosomes, because  they are different, Unlike other somatic  chromosomes which are known as    autosomes  because of similar morphology.

<u>  If a gene  is found on  X chromosome,  but with  no corresponding match  on Y-chromosomes ; that is not   available  on Y chromosome,  the gene </u><u>said to be a sex-link-gene.</u>

<u />

<u>T</u>herefore diseases transmitted by this gene are said to be sex-linked diseases, that is it is linked to the gender or sex-  that the chromosomes, will determine.(since pairing of XY-male and XX - female).

Thus if the sex-linked gene is present on X-chromosome, of both parents, the girl child  inherits the sex-linked diseases.<u> One defective X-chromosomes from each parent.</u>

<u />

<u> </u>However, if the gene is present on the inherited   X-chromosomes of the mother, and the Y chromosomes of the father, the male child is Sex-linked.

In a carrier mother with one X-chromosomes of sex-linked disease and the other of free  of sex-link, if the girl child inherits this sex-linked gene from the mother, and normal X- chromosomes from the father, the girl child who now has one sex-linked gene, and other normal X-chromosomes of the father is said to be a carrier. Thus such a girl child is not affected, but can pass the defective gene in subsequent generation provided she gets married to  a man with sex -linked gene.

Men are not carriers of sex-linked  diseases because, men only have 1 X-chromosomes, the  Y-chromosomes  is very weak, smaller than the X, and therefore can not bear the  sex-linked genes. This explains the reasons why most sex-linked characters of females are usually inherited from fathers.

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