Sex Linked Traits
Karyotype pictures
Male and Femals Sex Cells
Karyotypes (video)
Human Genetic Traits (video)
Sex Linked Traits
Genes are found only on the X chromosomes
Disorders (that we will discuss)– Color blind– Hemophilia
XY = MaleXX = Female
Color Blind
Gene represented by a superscript C Only found on the X chromosome Can not distinguish reds and greens. The
colors appear brown. 1:12 males 8% of U.S. population 1:200 females .5% of U.S. population
www.ikm.jmu.edu/.../ hemophiliaeurope.html
Color blind (video)
Possibilities
Male– XY normal sight
– XCY colorblind
Female– XX normal sight
– XCX or XXC trait carrier
– XCXC colorblind
Stoplights
Colorblind Eye Charts
Statistics for Colorblindness
The color blindness test consists of a set of five charts. Each chart shows a number in one color on a different background color. People with normal color vision will have no problem seeing the numbers on the charts, but people with color blindness will see only random colored dots. Seventy-five percent of color blind people have poor green perception. Of the remaining, 24% have poor red perception, and one percent are affected by a rare tritan type.
Hemophilia
Blood does not clot Represented by a H superscript on
the chromosome
www.ikm.jmu.edu/.../ hemophiliaeurope.html
Possibilities
Male– XY normal blood
– XHY Hemophilia
Female– XX normal blood
– XHX or XXH trait carrier
– XHXH Hemophilia
Royal Family Pedigree
The European Royal Family
www.ikm.jmu.edu/.../ hemophiliaeurope.html
Hemophilia (video)
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