1 / 5

TEST CROSS

TEST CROSS. How to tell the difference between homozygous and heterozygous individuals that have dominant phenotypes. © 2007 Paul Billiet ODWS. Selfing or test cross?. Plants can be selfed Homozygous plants (AA) are pure breeding

erwin
Download Presentation

TEST CROSS

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. TEST CROSS How to tell the difference between homozygous and heterozygous individuals that have dominant phenotypes © 2007 Paul Billiet ODWS

  2. Selfing or test cross? • Plants can be selfed • Homozygous plants (AA) are pure breeding • Heterozygotes (Aa) will give 75% dominant (AA and Aa) and 25% recessive (aa) phenotypes in their offspring • Animals are not usually hermaphroditic so they cannot be selfed • Animals require a test cross to be carried out (though these days a gene probe is more likely to be used). © 2007 Paul Billiet ODWS

  3. Coat colour in mice • Grey mice could have one of two different genotypes, GG or Gg. • If they are crossed with a white mouse (gg) these genotypes will give two different results © 2007 Paul Billiet ODWS

  4. © 2007 Paul Billiet ODWS

  5. © 2007 Paul Billiet ODWS

More Related