Practice Codominance And Incomplete Dominance Worksheet Answer Key

Introduction

In genetics, codominance and incomplete dominance are two important concepts that explain how traits are expressed in organisms. These concepts are often taught in biology classes and students are usually given worksheets to practice their understanding. In this article, we will provide you with the answer key to a practice worksheet on codominance and incomplete dominance.

What is Codominance?

Codominance is a genetic concept where two alleles of a gene are expressed equally in an organism. This means that neither allele is dominant over the other and both are expressed in the phenotype of the organism. An example of codominance is the ABO blood group system in humans.

Example:

If an individual has one allele for blood type A and one allele for blood type B, they will have a blood type AB. In this case, both alleles are expressed equally and there is no dominant or recessive allele.

What is Incomplete Dominance?

Incomplete dominance is a genetic concept where neither allele is completely dominant over the other. Instead, the phenotype of the organism is a blend of the two alleles. An example of incomplete dominance is the flower color in snapdragons.

Example:

If a red snapdragon plant is crossed with a white snapdragon plant, the offspring will have pink flowers. In this case, neither the red allele nor the white allele is dominant, and the phenotype is a blend of both.

Practice Worksheet Answer Key

1. In a codominant system, both alleles are expressed equally in the phenotype of the organism. 2. In an incomplete dominant system, neither allele is completely dominant over the other. 3. An example of a codominant system is the ABO blood group system in humans. 4. An example of an incomplete dominant system is the flower color in snapdragons. 5. If an individual has one allele for blood type A and one allele for blood type B, they will have a blood type AB. 6. If a red snapdragon plant is crossed with a white snapdragon plant, the offspring will have pink flowers. 7. The phenotype of an organism is determined by its genotype. 8. A dominant allele is expressed in the phenotype over a recessive allele. 9. A recessive allele is only expressed in the phenotype if the individual has two copies of the allele. 10. In a heterozygous individual, the dominant allele is expressed in the phenotype.

Conclusion

Codominance and incomplete dominance are important genetic concepts that explain how traits are expressed in organisms. Understanding these concepts is essential for students of biology. We hope that this answer key to a practice worksheet on codominance and incomplete dominance will help students better understand these concepts and prepare for their exams.