1 / 9

HUMAN GENETICS

HUMAN GENETICS. All the rules for genetics also apply to human beings. However, humans are harder to study for genetics. Humans are not sexually mature for 12-18 years Humans only have 1-3 offspring at a time, and most humans only have 1-5 offspring

Download Presentation

HUMAN GENETICS

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. HUMAN GENETICS All the rules for genetics also apply to human beings. However, humans are harder to study for genetics • Humans are not sexually mature for 12-18 years • Humans only have 1-3 offspring at a time, and most humans only have 1-5 offspring • At any one time, only 2 or 3 generations are alive.

  2. Special circumstances • X linked genes Most genes are found on the autosomes (chromosomes 1-22). Some genes are found on the X chromosome. In these cases, they are expressed differently in men than in women.

  3. HEMOPHILIA Hemophilia is a disease where a person is unable to stop bleeding from a cut. It is a recessive gene on the X chromosome. Males inherit hemophilia differently from females.

  4. MALES XH Y this is a male without hemophilia (dominant) Xh Y this is a male with hemophilia (recessive) A man inherits hemophilia from his mother (why?)

  5. FEMALES XHXH this is a female without hemophilia. She cannot pass hemophilia to her children. XHXh this is a female without hemophilia. She can pass hemophilia to her children. XhXh this is a female with hemophilia.

  6. Assume a woman heterozygous for hemophilia marries a man without hemophilia? Write parental genotypes: woman: XHXh man: XHY

  7. PUNNETT SQUARE XH Xh XHXH XH XHXh XHY Y XhY

  8. None of the daughters have hemophilia. Half of the sons have hemophilia.

More Related