1 / 10

Introduction to Human Heredity

Introduction to Human Heredity. Chromosome Theory and Sex L inked Traits. Chromosome Theory. Walter Sutton discovered the connection between inheritance and chromosomes. . Chromosome Theory. Gene Linkage : Genes that are located close to each other on the same

dori
Télécharger la présentation

Introduction to Human Heredity

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript


  1. Introduction to Human Heredity Chromosome Theory and Sex Linked Traits

  2. Chromosome Theory Walter Sutton discovered the connection between inheritance and chromosomes.

  3. Chromosome Theory Gene Linkage: Genes that are located close to each other on the same chromosomes are said to be linked and usually travel together during gamete formation.

  4. Human Heredity • Thomas Hunt Morgan was born September 25, 1866. • He began experimenting with drosophila, the fruit fly in 1908. He bred a single white eyed male with a red eyed female. All the offspring produced, both male and female, had red eyes. Morgan then bred these male and female siblings, which resulted in some of the offspring having red eyes and some white eyes. Upon close observation, he discovered that all the white eyed fruit flies were males. This study led to the discovery of sex-linked traits.

  5. Sex Linked Traits: Boys, blame it on your mothers! * Traits controlled by genes on the X chromosome. * Since males have only 1 X chromosome (XY), which they receive from their mother, they are affected by sex linked traits much more often than females. * Females would only express a sex linked trait if both X chromosomes had the gene. * Examples: Duchene muscular dystrophy, red-green colorblindness, hemophilia.

  6. Sex Linked Traits: Boys, blame it on your mothers! Duchene Muscular Dystrophy: -inherited genetic disorder that involves rapidly worsening muscle weakness. -Death usually occurs by age 25 typically from lung disorders.

  7. Sex Linked Traits: Boys, blame it on your mothers! Can you read the number in the picture?

  8. Red-Green Colorblindness • If you cannot see the number 8 in the previous picture then you have red green colorblindness.

  9. Hemophilia • Inherited genetic disorder that is characterized by delayed clotting of blood. • “Free Bleeders” • View pedigree of hemophilia in the family of Queen Victoria of England on Page 308 of your textbook. You will be using this to answer several questions.

  10. Hemophilia

More Related