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Genetics Basics: Difference between Codominance and Incomplete Dominance
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Genetics Basics: Difference between Codominance and Incomplete Dominance

Understanding Incomplete Dominance and Codominance

Introduction to Genetics

  • The video introduces the concepts of incomplete dominance and codominance, referencing Gregor Mendel as the father of genetics known for his work with pea plants.
  • Mendel's experiments involved crossing pea plants to study offspring traits, where typically one trait would mask another.

Incomplete Dominance Explained

  • Incomplete dominance occurs when two different phenotypes are crossed, resulting in a third phenotype that is a blend of the two.
  • An analogy is made using paint mixing: combining red and white yields pink, illustrating how traits can blend together.
  • Real-life examples include:
  • Snapdragon flowers (white and red produce pink).
  • A pin representing an offspring from black and white parents resulting in a greyish-blue color.

Codominance Explained

  • Codominance differs from incomplete dominance as both traits appear simultaneously without blending.
  • Examples of codominance include:
  • A spotted cow with both white and brown patches.
  • Speckled chickens showing both black and white feathers together.
  • The four o'clock plant where both alleles manifest distinctly.

Summary of Key Differences

Video description

Difference between co-dominance and incomplete dominance Gregor Mendel is the father of genetics. He is famous for his pea plants. He would cross pea plants and study the offspring The traits he studied had two alleles and one would mask the other trait. However, life does not always act this way. Sometimes you get a mixing of traits or both traits appear. In other words a third phenotype In this video I would like to talk about the difference between incomplete dominance and codominance. With incomplete dominance when you cross two individuals with two phenotypes you get a third phenotype that is a blending. You end up with something in-between. Think of mixing paints. If you mix red and white you get an in-between color which is pink Blue and yellow is green again in-between Here are some real life examples: Snapdragon Mix a white and red flower and get a color in-between which is pink This Andalusian hen is the offspring of an off white and black parents and you get this in-between color. With co-dominance both traits appear. Remember co means together Like co-operate = working together. One common example involves a white and brown cow and you get a spotted cow with white and brown. A speckled chicken is an example of codominance The black and white alleles cooperate and appear together. A four o'clock plant is another example of the alleles both appearing. They are co-operating and appearing together. Gene vs Allele https://youtu.be/KVUjpoZ12k0