1 / 7

Dihybrid Crosses

Dihybrid Crosses. Two characteristics at once…. Dihybrid crosses are where we consider heredity in two characteristics at the same time. There are four possible combinations of two characteristics. Example: Pea color and shape. Peas can be... 1) round and yellow 2) round and green

conan-dyer
Download Presentation

Dihybrid Crosses

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. Dihybrid Crosses

  2. Two characteristics at once… • Dihybrid crosses are where we consider heredity in two characteristics at the same time. • There are four possible combinations of two characteristics. Example: Pea color and shape. Peas can be... • 1) round and yellow • 2) round and green • 3) wrinkled and yellow • 4) wrinkled and green

  3. P generation cross… X Phenotype Round, yellow Wrinkled, green rryy RRYY Genotype all RY all ry Gametes all RrYy F1 All in F1 generation are heterozygous for both characteristics (all round and yellow)

  4. F1 generation cross… X Phenotype Round, yellow Round, yellow RrYy RrYy Genotype RY, Ry, rY, ry RY, Ry, rY, ry Gametes F2 We really need a punnet square for this…

  5. F2 generation ratio : : : 9 3 3 1 Round Yellow Round Green Wrinkled Yellow Wrinkled Green This is the typical ratio expected in an F1dihybrid cross

  6. Now for trihybrid Crosses...?

More Related