Exploring Non-Mendelian Genetics: Incomplete Dominance and Codominance

The video from the Learning Science Channel introduces the concepts of incomplete dominance and co-dominance in genetics. It explains how these non-Mendelian inheritance patterns differ from traditional Mendelian genetics. Incomplete dominance results in a phenotype that is intermediate between two homozygous phenotypes, while co-dominance results in both alleles being equally expressed. Examples include flower color in plants and hair color in cattle. The video concludes with an interactive question to test viewers' understanding.

What is the main focus of today's video?

• Geology

• Quantum physics

• Cellular biology

• Mendelian patterns of inheritance

What is an example of incomplete dominance?

• A yellow Gummela plant

• A blue Gummela plant

• A pink Gummela plant

• A green Gummela plant

What pattern of inheritance does the Gummela plant example illustrate?

• Mendelian inheritance

• Incomplete dominance

• Polygenic inheritance

• Co-dominance

In incomplete dominance, what is the phenotype of the offspring when a red flowered plant is crossed with a white flowered plant?

• Red

• White

• Pink

• Purple

What is the genotypic percentage of RW in the first cross of incomplete dominance?

• 25%

• 50%

• 75%

• 100%

What is the phenotypic ratio in the second cross of incomplete dominance?

• 2:2

• 3:1

• 1:1

• 1:2:1

What does co-dominance result in?

• A blend of traits

• Traits of both parents equally

• Only dominant traits

• Only recessive traits

In co-dominance, what is the phenotype of the offspring when a red hair cattle is crossed with a white hair cattle?

• Red

• Roan

• Black

• White

What is the phenotypic percentage of Roan cattle in the second cross of co-dominance?

• 50%

• 75%

• 25%

• 100%

What is the genotypic ratio in the second cross of co-dominance?

• 1:1

• 3:1

• 2:2

• 1:2:1