ok, imagine i'm a 5th grader: can you explain to me why men only 'suffer' from color blindness?

Answer 1

Color blindness is a sex-linked thing (giggles from the 5th grader)
The gene is on the X chromosome. Men get one X and one Y chromosome. If their X has the gene for color blindness, there is no matching gene on the Y chromosome to "cover" for the defective gene. The color blindness is expressed.

Women, however, are blessed with 2 X chromosomes. If they get a gene for color blindness, the other X usually has a normal gene that can "do the work" that the abnormal gene cannot. Color blindness is not expressed, and she is a carrier of the gene.

Women can be color blind if their color blind Dad marries a carrier Mom, and she gets 2 defective genes.

How's that?

Answer 2

Women can have it, but it's more rare.

It's results from a mutation on the X chromosome. It's on a part that has no match on the Y chromosome. Since men have to use that gene whether or not it's right, a man with the color blindness gene will be colorblind

Since women have two X's if they have a bad copy on one they can use the good copy on the other. Rarely a woman will have the mutation on both X's and she'll be color blind as a result. It's a rare gene, so getting two bad copies is very uncommon.

Suffer is a bit harsh, the color coding of the man-made world has been designed with normal vision in mind, colorblindness is a slight disadvantage when viewed with that in mind. However the mutation is too common for it to have always been a disadvantage. It's been demonstrated that people with red green colorblindness can make out camouflaged objects more readily than normal people.

Answer 3

the reason being that the defective gene that directs production of the defective pigment is carried on the comparable pair of chromosomes that determines the intercourse of the new child. In a female descendant (who has 2 X intercourse chromosomes), a defective gene on one X chromosome is very customarily counteracted by capacity of a classic gene on the different X chromosome; as a effect, the female is born with commonplace coloration resourceful and prescient. In a male new child (who has an X and a Y intercourse chromosome), there is not any matching commonplace gene to block the sickness on the only X chromosome the boy has; the boy is, for this reason, born coloration-blind. pink-eco-friendly coloration blindness won't be able to be surpassed from a father to his sons, nor will his daughters be coloration-blind, till the mum consists of the defective gene besides. in spite of the indisputable fact that, his daughters will all be companies of the defective gene, and the daughters' sons could have a 50 % probability of being coloration-blind.

Answer 4

Men and Women can get color blindness however, men are the more common and women are rare. Generally if one type runs in your family, for example men are the one who get it then it is more likely that that will be what happens in the family. So it will be even more unlikely that a woman will get it if only the men in the family have been prone to get it.

There are many types of color blindness. The most common variety are hereditary (genetic) photoreceptor disorders, but it is also possible to acquire color blindness through damage to the retina, optic nerve, or higher brain areas.

Answer 5

Color blindness is a sex linked recessive gene. It occurs only on the X chromosome. If there is a normal copy of the gene, it can make up for the bad copy. Women have the genotype (chromosomes) XX, and men have the genotype XY. In the case of a woman, if an X chromosome has a bad copy of the gene for seeing color, and her other chromosome is carrying the normal gene, then she will not be color blind. However, if a man has the bad gene, then he doesn't have another copy, and will be colorblind. A woman can be colorblind too, if she has two bad copies of the gene.

Answer 6

All girls have genes that make them girls. We call them XX.

All boys have genes that make them boys. We call them XY.

Color-blindness "lives" on some X genes.

If a girls gets one X gene that includes colorblindness, the other X gene is stronger and covers up the colorblindness. She will not be color blind.

If a boy gets an X gene that includes color blindness, he doesn't have another X gene to cover it up. The Y gene does not cover up color blindness. So that boy WILL be color blind.

If a girl gets two X genes (one from her mother and one from her father) that include color blindness, then she will be color blind, too.

So, not *only* boys 'suffer' from colorblindness but it is true that many more boys then girls are colorblind, yes.

Here are some examples of how colorblindness is passed from parents to their children.

Example 1:
Colorblind father (X*Y), normal mother (XX)

(1)Father..........X*......... Y
(2)Mother
.
X.. . . . . . . .XX*(3). . . .XY(4)
.
X. . . . . . . . .XX*(5).......XY(6)

(1) Color blind father.
(2) Normal vision mother
(3) Child 1 -- girl -- carries color blindness gene from father but is not color blind (called 'recessive' for color blindness).
(4) Child 2 -- boy -- normal vision -- got normal X from mom and Y from dad
(5) Child 3 -- girl -- same as her sister -- carrier
(6) Child 4 -- boy -- same as his brother


Example 2:
Normal father (XY), mother carries recessive gene for color blindness (X*X)

(1)Father..........X.......... Y
(2)Mother
.
X*.. . . . . . . .X*X(3). . . .X*Y(4)
.
X. . . . . . . . .XX(5). . . . .XY(6)

(1) Normal vision father.
(2) Mother carries gene for color blindness (X*) but she is not color blind
(3) Child 1 -- girl -- carries color blindness gene but is not color blind.
(4) Child 2 -- boy -- colorblind
(5) Child 3 -- girl -- normal
(6) Child 4 -- boy -- normal


Example 3:
Color blind father (X*Y), mother caries gene for colorblindness (X*X)

(1)Father..........X*......... Y
(2)Mother
.
X*.. . . . . . . .X*X*(3). . . .X*Y(4)
.
X. . . . . . . . .XX*(5). . . . .XY(6)

(1) Colorblind father.
(2) Mother carries gene for color blindness (X*) but she is not color blind
(3) Child 1 -- girl -- colorblind.
(4) Child 2 -- boy -- colorblind
(5) Child 3 -- girl -- carries color blindness gene but is not color blind
(6) Child 4 -- boy -- normal


Do you understand now, little 5th grader?
(-;

Answer 7

It's not only men, however women are much more rare. It's passed on through genetic lines via gender specific carriers, such as only males will be affected or only females will be affected.

Answer 8

What bflatel 13 & Sebille said...= D

Answer 9

They're just pretending so they don't have to buy red roses for their girlfriends.

Answer 10

some men don't know the truth when they "see" it.