1 / 11

What the . . . Punnett!!!

What the . . . Punnett!!!. You and 1 partner: 1) Come up with a hypothesis of how this could be (“if” and “then”) 2) Make a punnett square to support your hypothesis 3) Be able to defend your hypothesis. Beyond Mendel. Codominance and Incomplete Dominance. Mmmendel!. Polygenic Inheritance

Jims
Download Presentation

What the . . . Punnett!!!

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. What the . . . Punnett!!! • You and 1 partner: 1) Come up with a hypothesis of how this could be (“if” and “then”) 2) Make a punnett square to support your hypothesis 3) Be able to defend your hypothesis

  2. Beyond Mendel Codominance and Incomplete Dominance Mmmendel!

  3. Polygenic Inheritance • Many genes code for that 1 trait • Ex: • Eye color, • height, and • skin color Order of dominance: brown > green > blue.

  4. Multiple Alleles • If there are more than two different alleles for that gene in the gene pool. • Example: ABO blood type (IA , IB and i).

  5. Incomplete Dominance • Definition: A situation in which one allele is not completely dominant over another. • The heterozygous phenotype is somewhere in between the two homozygous phenotype.

  6. Tricks of Incomplete Dominance • 1) Letters we use are both capitals because both are dominant! • 2) The offspring show a third phenotype • 3) The offspring show a blending of the parental traits

  7. BlahBlahBlah!!! • Question: A cross between a blue blahblah bird & a white blahblah bird produces offspring that are silver.  The color of blahblah birds is determined by just two alleles. • 1) What are the genotypes of the parent blahblah birds in the original cross?  • 2) What is/are the genotype(s) of the silver offspring? • 3) What would be the phenotypic ratios of offspring produced by two silver blahblah birds?

  8. Codominance • Definition: Situation in which both alleles of a gene contribute to the phenotype of an organism • Often produces offspring known as “eminette”

  9. Sickle Cell Anemia • Codominant • A=normal, S=Sickle • AA = Normal – Malaria • AS = Hetero – No Malaria • SS = Sickle – No Malaria

More Related