1 / 8

14. Pedigrees/ Human Genetics

14. Pedigrees/ Human Genetics. Fruit Fly- Drosophila melanogaster, used by scientists to study genes and heredity. Advantages of Fruit Flies Short Life Span Small and easy to maintain 8 Chromosomes. Human Chromosomes - 46 total (23 pairs).

lynnet
Download Presentation

14. Pedigrees/ 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. 14. Pedigrees/ Human Genetics

  2. Fruit Fly-Drosophila melanogaster, used by scientists to study genes and heredity. Advantages of Fruit Flies Short Life Span Small and easy to maintain 8 Chromosomes

  3. Human Chromosomes- 46 total (23 pairs) Autosome- 22 pairs of non-sex cells determining traits. Sex Chromosomes- one pair of chromosomes determining gender.

  4. Karyotype Karyotype- picture of all the chromosomes lined up during metaphase taken about half way through pregnancy used to determine a chromosomal abnormality. (blood cells)

  5. Determining Sex Male- XY Female- XX Sex-Linked Traits- traits caused by genes that are located on the sex chromosomes. Ex. Color Blindness, Pattern Baldness, Hemophilia Why Males are affected more than females X chromosome is larger than Y chromosome so it holds more genes. Both X’s must have gene to be expressed in females whereas only one X in a male must have gene to be expressed.

  6. Pedigree Analysis Pedigree Analysis- diagram of a family history that shows how one trait is passed through several generations. *Used by healthcare workers to help parents determine the likelihood of passing on genetic disorders.

  7. Symbols of a Pedigree O = Female = Male / = Affected female/ male ___ = Marriage = Offspring

  8. Rules of a Pedigree Fill in the shaded people with homozygous recessive (rr). The non-shaded in people will receive at least one capital. Determine the second letter on the non-shaded in people by looking at parents, siblings and children

More Related