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Interactive video lesson plan for: Codominance- Incomplete Dominance -Multiple alleles

Activity overview:

When Mendel studied traits the traits what he studied were influenced by only one gene or two alleles.
Since then geneticists have discovered traits that are influenced by multiple alleles, genes, and some are even codominant
In this video I would like to talk about incomplete dominance, codominance, multiple alleles, and polygenic inheritance.


When you cross a four oclock flower or a snap dragon you have an example of incomplete dominance. In other words both traits show up or mix together.
When you cross a white and red flower you get a pink flower.
If you cross the pink flowers you could get white red or even pink.

With codominance both alleles show up in the phenotype.
Check out this Punnett square of these two cows. The white and brown color are both dominant and therefore they both appear. They don't blend, but instead both show up.
This cow is an example, pause and this speckled chicken

Sometimes more you have multiple alleles that control a trait. With human blood type the blood type is controlled by three alleles.
In this chart you will see that type a and type b are controlled by multiple alles.

Finally, some traits are controlled by multiple genes,called polygenic inheritance .
In humans our height, skin color, and eye color are controlled by multiple genes.
As a result you have many more types of phenotypes.
Notice in the chart the different combinations and results.

In summary
Codominance you have mixing or blending of alleles
Incomplete dominance both traits appear
In multiple alleles traits have more than two alleles.
Finally, polygenic inheritance a trait is controlled by multiple genes..

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Please watch: "Study Skills Teacher's Secret Guide to your Best Grades"
https://www.youtube.com/watch?v=f3bsg8gaSbw
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Tagged under: genetics,codominance,incomplete dominance,multiple alleles,moomoomath science,dominant trait,traits,snapdragon flower

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