Questions: Question 20 1 pts What is the term that describes when one gene for a trait completely masks the effect of another gene for the same trait? Complete dominance Co-dominance Over-dominance Incomplete dominance

The answer is the first one: Complete dominance.

Explanation for each option:

1. Complete dominance: This is the correct term. It describes a situation where the presence of one allele completely masks the effect of another allele for the same trait. In this case, the dominant allele's trait is expressed, while the recessive allele's trait is not visible in the phenotype.

2. Co-dominance: This is incorrect. In co-dominance, both alleles for a trait are fully expressed in the phenotype. An example is the AB blood type, where both A and B alleles are expressed.

3. Over-dominance: This is incorrect. Over-dominance refers to a situation where the heterozygote has a trait that is more beneficial or pronounced than either homozygote. It is not about masking the effect of another gene.

4. Incomplete dominance: This is incorrect. In incomplete dominance, the phenotype of the heterozygote is a blend or intermediate of the phenotypes of the homozygotes. Neither allele completely masks the other.

In summary, the term that describes when one gene for a trait completely masks the effect of another gene for the same trait is complete dominance.