Sex limited traits - Angelman syndrome and Prader-Willi...

Info iconThis preview shows pages 1–2. Sign up to view the full content.

View Full Document Right Arrow Icon
Sex limited traits As we have seen, sex linked traits are generally expressed much more often in males than in females. You should be aware however that some traits which affect one sex more than another are not necessarily sex linked. Examples are cases of sex limited expression which might include genes affecting beard growth or breast size, and (in cattle), horn growth and milk yield. These genes have no visible affect in one sex because the necessary machinery to express them is not present. Sex influenced traits On the same general line as sex limited traits are sex influenced traits. Pattern baldness is a condition which is dominant in men but recessive in women. Imprinting Some genes are inactivated when transmitted through one sex.
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Background image of page 2
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: Angelman syndrome and Prader-Willi syndrome are two different conditions both of which seem to be caused by very similar deletions of a small part of chromosome 15. In this diagram, two genes are shown in the critical region. Each is inactivated by imprinting , the Angelman syndrome gene is turned off on the chromosome inherited from the father while the Prader-Willi gene is turned off on the maternally transmitted chromosome. When a deletion covering the region is inherited on the other chromosome one syndrome or the other results. Recommended reading The topics include: • sex determination • sex chromosomes • sexual identity • sex linkage • X inactivation • sex limited and sex influenced traits • imprinting...
View Full Document

This note was uploaded on 11/22/2011 for the course CHEMISTRY CHM1025 taught by Professor Laurachoudry during the Fall '10 term at Broward College.

Page1 / 2

Sex limited traits - Angelman syndrome and Prader-Willi...

This preview shows document pages 1 - 2. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online