Sex-Linked Genetics. What are sex chromosomes? X and Y Which sex chromosome is home of most sex-linked traits? X (much larger). Karyotypes: Is this a male or female?. Male. What are examples of traits that are sex-linked?. What are examples of traits that are sex-linked?
What are sex chromosomes? X and Y
Which sex chromosome is home of most sex-linked traits? X (much larger)
What are examples of traits that are sex-linked?
1)Color blindness – (red-green)
3) Muscular Dystrophy
4) Male pattern baldness
All are on the X-chromosome
Circle, Square, star,
Faint Brown boat, colorblind individuals would have seen nothing.
Colorblind individuals should see a yellow square.
Normal sight should see circle and square.
Czar Nicholas II of Russia and his family, photographed c. 1916, showing his wife Alexandra (who was a carrier of hemophilia), his four daughters, and (in the foreground) his son Alexis, perhaps the most famous European royal with hemophilia. http://www.humanillnesses.com/original/Gas-Hep/Hemophilia.html
Muscles form incorrectly, including heart and lungs
death by early 30’s
Some evidence hints at X linked status
Androgens (male sex hormones) play a key role in balding--castrated men don't go bald--and the AR gene helps them do their work. The researchers found the balding men were much more likely to have a particular version of the AR gene than the non-balding men, which they took to mean they'd found a genetic variant that triggers baldness.
B = normal b = colorblind
H = normal h = hemophilia
M = normal m = muscular dystrophy
Male pattern baldness
P = normal p = male pat. baldness
Normal (Carrier) female
Female with M.D.
Normal, carrier female
1. Dom = normal Rec= hemophilia
2. H = normal h = hemophilia
3.Mom= XhXh Dad= XHY