Codominance and Incomplete Dominance Concepts

The video tutorial introduces non-Mendelian genetics, focusing on incomplete dominance and codominance. Incomplete dominance is explained with examples like snapdragon flowers, where neither allele is completely dominant, resulting in a blend of phenotypes. Codominance is illustrated with roan cows, where both alleles are equally expressed, leading to a speckled appearance. The video also covers allele notation and Punnett squares for both inheritance patterns.

What is the main characteristic of incomplete dominance?

• One allele is completely dominant over the other.

• Both alleles are expressed equally.

• Neither allele is completely dominant, resulting in a blend.

• Both alleles are recessive.

In the example of Snapdragon flowers, what color results from the cross of red and white flowers?

• White

• Pink

• Yellow

• Red

What is the allele notation used for incomplete dominance in Snapdragons?

• Lowercase letters

• Uppercase letters with a prime symbol

• Numbers

• Greek letters

What is the phenotype ratio for incomplete dominance in Snapdragons?

• 3:1

• 1:2:1

• 1:1

• 2:1

How does codominance differ from incomplete dominance?

• Only one allele is expressed.

• One allele is recessive.

• Both alleles are expressed equally without blending.

• Neither allele is expressed.

In codominance, what is the phenotype of a roan cow?

• Solid red

• Pink

• Solid white

• Spotted with both red and white

What is the base letter used in allele notation for codominance in cows?

• C

• B

• W

• R

What is the genotype ratio for codominance in roan cows?

• 1:1

• 2:1

• 1:2:1

• 3:1

In codominance, what does the raised letter represent?

• The recessive allele

• The base trait

• A mutation

• One of the codominant alleles

What is the importance of labeling genotype and phenotype ratios?

• To ensure clarity in understanding genetic outcomes

• To confuse the reader

• To make the problem more complex

• To avoid using numbers