Anthro 105: 01/23/11 – Class Notes

Read chapter 12 for Weds.   X-Linked Hemophilia Gene is located on the X-chromosome, thus males and females are affected differently. Females = XX Males = XY Hemophiliac Male (XhY) – only 1 X-Chromesome with recessive gene causes disorder. Hemophiliac Female (XhXh) – both X’s must carry the recessive gene. A male hemophiliac cannot pass the gene to his son, only his daughter as he only passes on the Y to his sons. Polygenetic Inheritance Two or more genes contribute to the phenotypic expression of a single characteristic These traits show gradations, there is a series of measurable intermediate forms between two extremes. Hair, eye and skin color are polygenetic traits. Traits can be influenced by your environment. Regulatory genes: can...