4. Fill the table below to demonstrate a cross between a woman with normal visio
ID: 25895 • Letter: 4
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4. Fill the table below to demonstrate a cross between a woman with normal vision whose father was colorblind and a man with normal vision.Explanation / Answer
A women who is color blind marries a man who has normal vision what do you expect their offspring to be? Eyes and Vision Disorders Questions Answers.com > Wiki Answers > Categories > Health > Conditions and Diseases > Eyes and Vision Disorders Best Answer "their offspring may have normal vision as colour blindness is not a genetic disorder but it is caused due to the lack of cones in the retina of the eye." Color blindess absolutely is a genetic disorder. Sometimes it is inhereted, other times, it is a gene mutation that happens on its own. The most common type of color blindness is a sex-linked trait, meaning the gene is carried on the chromosomes that determine sex. In this case, it's carried on the X chromosome. There are other types of color blindness that are inhereted that are not sex-linked, so it doesn't matter which parent is the carrier. Males are XY, and therefore can pass either an X or Y to their offspring, making them the actual determinants of the sex of the offspring. Females are XX, and so can only contribute an X. In the case of color blindness, since males only get one X, if that has the gene for color blindess on it, the male will be color blind (in this case, we'll call that one "x" rather than "X". In the case of females, she has two - so if only ONE of her X has the gene, she will be a carrier, but will not have it (Xx). If her father is colorblind (xY), and her mother is a carrier (Xx), she has a 50% chance of being colorblind (she'll either be "xx" or "Xx). If her mother IS colorblind (xx) and her father is too (xY), then there is only one outcome: "xx". So, if a color blind mother (xx) has children with a non color blind father (XY), there are the possibilites: xX, xY. Her daughters will be carriers, and her sons will be color blind. If a color blind mother (xx) has children with a color blind father (xY), then these are the possiblities: xx, xY. All children will be color blind. So, to sum up, a mother with sex-linked colorblindness will always have color blind sons, and daughters will have a 50% chance of being color blind, depending on if the father is or not.
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