1 / 15

Genotypic ratio: all AA

AA X AA. A. A. AA. AA. A. A. AA. AA. Genotypic ratio: all AA. Phenotypic ratio: all red. AA X Aa. A. A. AA. AA. A. a. Aa. Aa. Genotypic ratio: 1AA:1Aa. Phenotypic ratio: all red. AA X aa. A. A. Aa. Aa. a. a. Aa. Aa. Genotypic ratio: all Aa.

kuame-wong
Download Presentation

Genotypic ratio: all AA

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. AA X AA A A AA AA A A AA AA Genotypic ratio: all AA Phenotypic ratio: all red

  2. AA X Aa A A AA AA A a Aa Aa Genotypic ratio: 1AA:1Aa Phenotypic ratio: all red

  3. AA X aa A A Aa Aa a a Aa Aa Genotypic ratio: all Aa Phenotypic ratio: all show dominant trait

  4. Aa X Aa A a AA Aa A a aa Aa aa Genotypic ratio: 1 AA:2Aa:1aa Phenotypic ratio: 3 not red:1 red

  5. Aa X aa A a Aa aa Aa a Aa a aa Aa Genotypic ratio: 1 Aa:1 aa Phenotypic ratio: 1 red: 1white

  6. aa X aa a a aa aa a a aa aa Genotypic ratio: all aa Phenotypic ratio: all white

  7. Complete Dominance vs. Incomplete Dominance • Most traits display complete dominance • the presence of one dominant allele masks the recessive allele • Some traits display incomplete dominance the heterozygous condition results in a separate phenotype, neither allele is completely dominant-they blend together • In some flowers, AA is red, Aa is pink, and aa is white

  8. Codominance • Some traits are controlled by codominance: • both alleles for a gene are expressed in heterozygous offspring. • neither allele is dominant or recessive, nor do they blend; each is expressed equally. • the best example of this is in a horse’s coat color; heterozygous = roan color where they have both white and red hairs.

  9. Dihybrid Cross • dihybridcross • between individuals with two pairs of traits.

  10. Dihybrid Cross Rules • First figure out what the gametes are that the parents can make. Use the FOIL method to do this. Parents: AaBb X AaBb Gametes: AB, Ab, aB, ab X AB, Ab, aB, ab • Then place the gametes along the top and sides of the square and do the cross.

  11. Dihybrid Cross Gametes from Parent One (Female) Gametes from Parent Two (Male)

  12. Multiple Alleles • Several alleles exist for a trait

  13. Sex Influenced Traits • Traits expressed differently in males and females • Example: baldness BB Bb bb male bald bald not bald bald not bald not bald female

More Related