Co-Dominance in Genetics

The video tutorial introduces the concept of co-dominance, a non-Mendelian pattern of inheritance where both alleles are expressed equally. Examples include speckled chickens and human blood groups. The tutorial provides example problems involving co-dominance in cows, demonstrating how to determine genotypes and phenotypes using Punnett Squares. The video concludes with a call to subscribe for more educational content.

What was the topic of the previous lesson mentioned in the introduction?

• Co-dominance

• Genetic mutations

• Incomplete dominance

• Mendelian inheritance

In co-dominance, how are the alleles expressed?

• Neither allele is expressed

• Alleles blend to form a new trait

• Both alleles are expressed equally

• One allele is dominant over the other

What is an example of co-dominance in animals?

• A spotted dog

• A black cat

• A speckled chicken

• A striped tiger

Which blood type is an example of co-dominance?

• Type AB

• Type O

• Type A

• Type B

What are the genotypes of the parents in the white cow and red bull cross?

• WR and RW

• RW and WR

• RR and WW

• WW and RR

What is the phenotype of the offspring from the white cow and red bull cross?

• All red

• All white

• All rowan

• Mixed colors

In the cross of two rowan cows, what is the genotypic ratio of the offspring?

• 1:1:1

• 1:2:1

• 2:1:1

• 1:1:2

What is the phenotype ratio of the offspring when two rowan cows are crossed?

• 2 red, 2 rowan

• 1 red, 1 rowan, 2 white

• 2 red, 1 rowan, 1 white

• 1 red, 2 rowan, 1 white

What is the genotype of a rowan cow?

• RR

• WW

• RW

• WR

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