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Can only men be colour blind?
More men are color blind than women because the recessive gene for color blindness is carried by women on one of their X chromosomes. And since they have two X chromosomes, the recessive trait is less likely to be expressed. Since men have an X and a Y chromosome, which is shorter, if a mother passes on her X chromosome with the trait of color blindness, her son will have no corresponding gene on his Y chromosome from keeping it from being expressed. So men are color blind more often than women.
The gene for color blindness is a recessive allele located on the x chromosome. If a color blind man and color blind woman have one son and three daughters how many will be color blind?
Women can not be colorblind, only men. For questions like these a punnett square is useful. Men can not carry the colorblind trait, but women can. I know this is kind of confusing. When a carrier ( a woman with the color blind trait) has children with a man ( color blind or not) her kids will have 50% chance of having that trait. If its a girl, she will be the carrier. If its a boy, he will have the colorblind trait. SO TO ANSWER YOUR QUESTION: Theoreticaly, 1 of the daughters will be the carrier, and the son will have a 50% chance of being colorblind. Women can be colorblind, its just rare. About every 6400 women one is colour blind and with men, every 80 men 1 is colour blind.
What was the chance that the child will be color blind?
1 in 12 for men, 1 in 200 for women.
Why hemophilia and color blindness occur much more often in men than in women?
It is due to two factors. One is that these traits are coded on the x-chromosome, of which women have two, men only one (since it is paired with a y-chromosome in men). The other factor is that the two traits are both recessive, that is they are suppressed in the presence of the dominant, healthy allele. In men there is no other x-chromosome, which could provide a healthy allele to counteract the effect of the mutant alleles, therefore these disorders occur more frequently. However, due to mosaicism, and x-chromosome inactivation (Barr-body formation), women who carry the color-blind x-chromosome have color-blind patches in their retinas, or may even be nearly completely color-blind in one eye.
How do you get the disease of color blindness?
You do not get color blindness, you are either born with it or not born with it. It is on the X chromosome. A male has one X chromosome. A woman has 2 X chromosomes. If one X chromosome does not have red-green capability and the man has that chromosome, then he is color blind. A woman can have one color blind chromosome and one non-color blind chromosome and she will not be color blind. The ability to see blue and yellow is on chromosome number 7. Everyone has two of those. A man can only have 3 color chromosomes. Women can have 4 color chromosomes. Since the chromosomes can be slightly different, women can frequently see far more color variations than men can see.
What is the ratio of girls who are colour blind?
I don't know the ratio but I know that men are more likely to become colour blind because women have a backup gene.
Why did tiresias become blind?
He was blinded by Hera for his judgment than women enjoyed sex more than men.
In a survey 16 women out of 20 000 were found to be colour blind What is the expected frequency of colour blind males in this population?
Not all forms of color blindness are hereditary. There are three distinct types of hereditary color blindness, each with different frequencies in the human population, and with distinct genetic causes. Red-green color blindness is more common among males than females, but blue-yellow color blindness is not. Talking about color blindness in general, there is no reliable ratio of male-to-female prevalence.
Are blind men sexier to women?
maybe, maybe not but mostly NO
Does a blind man blinks his eyes?
Some do and some don't. Some blind men/women have their eyes completely shut, so they wouldn't have to blink. Some blind men/women have their eyes open, so they would usually blink.
Why do men choose ugly women over beautiful women?
Because they're stupid (and blind) !
Who is more apt to color blindness - males or females?
Genetic red-green color blindness affects men much more often than women, because the genes for the red and green color receptors are located on the X chromosome, of which men have only one and women have two. Such a trait is called sex linked Females (46, XX) are red-green color blind only if both their X chromosomes are defective with a similar deficiency, whereas males (46, XY) are color blind if their single X chromosome is defective. This sentence means that if both of the X chromosomes women are reccesive ten she has a color blindness trait. If the X chromosomes has one dominant X and one reccesive trait then she doesn't have the color blindness trait. The people who have color blindness trait are called a carrier.
