Sex Linked Traits. Karyotype pictures Male and Femals Sex Cells

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)