1 / 16

Sex Linked Inheritance:

Sex Linked Inheritance:. (why females are superior to males) (just kidding) (no, but seriously) (ok, I am kidding) (or am I?). Warm Up. What % probability will a child be born a male? Female? How could we set up a punnett square to show this?. Cornell Notes. Read pages 170-171

charde-wilkinson
Download Presentation

Sex Linked Inheritance:

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. Sex Linked Inheritance: (why females are superior to males)(just kidding)(no, but seriously)(ok, I am kidding)(or am I?)

  2. Warm Up • What % probability will a child be born a male? Female? • How could we set up a punnett square to show this?

  3. Cornell Notes • Read pages 170-171 • In the margin of your paper, define the bold terms. • In the large portion of your paper, discuss 3 main points. • On the bottom, summarize in 3 sentences what you read.

  4. The difference between males and females. • Females have 2 X chromosomes. • They always give one X to their offspring. • The X chromosome has more information than the Y. That’s why females are superior to males. • Males have 1 X chromosome and 1 Y chromosome. • They can give either to offspring.

  5. Human Genome Autosomes (1 – 22) Sex Chromosomes (X and Y)

  6. X Y

  7. Human Y-chromosome SRy locus Males have sperm cells which may have an X chromosome or a Y chromosome. Male gametes (sperm) determine the gender of the offspring when the egg is fertilized.

  8. Punnett Square to determine gender. • A male gamete XY chromosomes fertilizes the egg (XX). • What is the chance that the offspring will be female?

  9. Punnett Square to determine gender. X Y X X • A male gamete XY chromosomes fertilizes the egg.

  10. Punnett Square to determine gender. X Y X X • A male gamete XY chromosomes fertilizes the egg.

  11. X chromosomes have genes that Y chromosomes don’t. • X Chromosomes can be carriers of certain recessive traits. In females, the other X probably does not have the trait and can over rule the recessive diseased trait. Baldness Color Blindness DuchenneMuscular Dystrophy Adrenoleukodystrophy Fragile X Syndrome

  12. Punnett Square to determine gender. XB Y XB Xb • A carrier female for colorblindness, marries a normal man. • Will their children be color blind? • B= normal • b= color blind • Y’s don’t have the trait.

  13. Punnett Square to determine gender. XB Y XB Xb • A carrier female for colorblindness, marries a normal man. • Will their children be color blind? • B= normal • b= color blind • Y’s don’t have the trait.

  14. Punnett Square to determine gender. XB Y XB Xb • Normal Female • Normal Male • Carrier Female (isn’t colorblind) • Colorblind Male

  15. Inheritance patterns: • Sex-linked recessive conditions • The disease is never passed from father to son.Males are much more likely to be affected than females. • All affected males in a family are related through their mothers.Trait or disease is typically passed from an affected grandfather, through his carrier daughters, to half of his grandsons.

  16. PRACTICEOn your pink sheet of paper… practice the following…

More Related