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Calico Cats - Suppose X = color vision x = colorblind The...

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Calico Cats A calico cat has patches of orange and patches of black X = orange X 1 = black MALES: XY = orange X 1 Y = black FEMALES: XX = orange X 1 X 1 = black X X 1 = orange or black patches All cells descended from an X 1 cell (X is inactive) are orange-yellow. All cells descended from an X cell (X 1 is inactive) are black. Human Example - Anhydrotic Dysplasia Anhydrotic dysplasia is a disease that results in the absence of sweat glands. It is inherited as an X-linked recessive disease. Let X = normal sweat glands and X' = absence of sweat glands. Normal males are XY. Affected males are X'Y and do not have sweat glands. Normal females are XX, heterozygous females are XX' and have patches of skin with sweat glands and patches of skin without sweat glands. Females that are X'X' do not have sweat glands. Other Information Should heterozygous females for colorblindness be able to see color?
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Unformatted text preview: Suppose: X = color vision x = colorblind The Retina of a heterozygous (Xx) female will have some cells with the "X" inactivated and other cells with the "x" inactivated. A heterozygous carrier of red-green colorblindness has some colorblind cells in her retina. The non-colorblind cells enable her to see color. Turner's syndrome is an abnormality in females where there is only one X chromosome; the other is missing. These people have abnormalities that will be discussed in the next chapter. Why aren't Turners syndrome females normal? Evidence indicates that some genes in the Barr body remain active. Their DNA is uncoiled and extends from the Barr body. If the Barr bodies of a normal female were missing, she would exhibit Turners Syndrome....
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