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Answered 2010-10-27 07:44:42

We know that if a father is colorblind and the mother is neither colorblind nor a carrier, then the sons will not be colorblind. So, using logic, that means that the father can't cause a son to become colorblind. Process of elimination would point towards whenever a son is colorblind that it comes from the mother. A diagram explaining how colorblindness is inherited can be viewed in the related links.

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Why is red-green colorblindess called a sex-linked trait?

Humans are a diploid (2n) organism, which means 23 pairs of chromosomes for a total of 46. 22 of these pairs are autosomes, or homologous chromosomes, with 1 being contributed by each parent. The 23rd pair consists of the sex chromosomes, X or Y, with the mother always contributing an X and the father's sperm determining the sex of the baby with either an X or Y. Under most circumstances, the possibilities are either XX (girl) or XY (boy). The gene for the trait of red-green colorblindness codes on the X chromosome only and is referred to as X-linked. Fortunately, this X-linked trait (along with others like hemophilia) is recessive, or else there would be a high probability of large populations of humans who are red-green colorblind. However, there is one caveat, boys receive only 1 X chromosome (from their mother), which means for them it makes no difference whether the trait is dominant or recessive because if the gene is present, then it will be expressed. Here are the possibilities: If the mother is colorblind (both X's contain the gene), then all of her sons will be colorblind regardless of the father (remember the father contributes the Y). If the father is colorblind, then her daughters will also be colorblind; and if the father is not colorblind, then her daughters will be carriers (only 1 of their X's will contain the gene). If the mother is not colorblind, but is a carrier, then her sons will have a 50% chance of being colorblind regardless of the father. If the father is colorblind, then her daughters will also have a 50% chance of being colorblind; otherwise, they will be a carrier. If the father is not colorblind, then the daughters have only a 50% chance of being a carrier. If the mother is not colorblind, and is not a carrier, then her sons will not inherit the trait, regardless of the father. If the father is colorblind, then the daughters have only a 50% chance of being colorblind. Obviously, if neither parent is colorblind, nor a carrier, then children will have no chance of inheriting the gene. To further understand these probabilities, I suggest drawing a Punnett Square.


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A lone parent family is one in which there is only one parent. In lone parent family either there is the mother or the father. In lone parent family, one parent act as mother and father both .


How do you have a colorblind son if neither parent is colorblind?

It is just the DNA lottery. If neither parent is colorblind that just means that one of them (or both of them) have recessive genes for colorblindness that happened to show up in this particular child.


What is the difference between maternal and paternal?

Paternal is related to the father while maternal is related to the mother. Example: Your maternal parent is your mother and your paternal parent is your father.


Woman normal vison male color blind will their children be colour blind?

Color blindness is an X-linked trait. That means it is carried in the X chromosome, which differentiates whether a baby will be a girl or a boy. Women have two X chromosomes (XX), and men have an XY combination. If a woman is a carrier for color blindness, only one of her chromosomes will be affected (we'll call it a little "x"), and for that reason she will not be colorblind. Men, on the other hand, only have one X chromosome, so any time they carry the colorblindness gene, they will be colorblind. A woman will carry the colorblindness gene if: a. Her father is colorblind b. Her offpsring are colorblind She may carry the colorblindness gene if: a. Male family members (brothers, uncles, etc.) are colorblind A child inherits one chromosome from each parent. He/She will get an X chromosome from his/her mother, and an X from her father (if a girl) or a Y from his father (if a boy) So, If a woman has normal vision (assuming she does not have a family history of colorblindness), XX, and a man is colorblind, xY, they have several different chances for different offspring: Xx (a normal girl who carries the colorblindness gene) XY (a normal boy) Xx (a normal girl who carries the colorblindness gene) XY (a normal boy) The short answer is that ALL CHILDREN WILL HAVE NORMAL VISION. However, all daughters will be CARRIERS, meaning they can pass colorblindness on to their children.


A word for this question ''a mother or father''?

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What is a 6 letter word for mother or father?

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If a color blind male who has normal clotting blood marries a female who is a carrier of hemophilia and has normal color vision could they have a color blind child?

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