What inheritance pattern is when which both alleles are expressed equally?*1 pointCodominanceMultiple AllelesIncomplete DominanceSex-Linked Inheritance

1. Break Down the Problem

We need to identify which inheritance pattern features both alleles being expressed equally.

2. Relevant Concepts

• Codominance: A genetic scenario where both alleles in a heterozygous genotype are fully expressed, resulting in a phenotype that reveals both traits equally.
• Multiple Alleles: Refers to the presence of more than two allele options for a single gene, not necessarily involving their equal expression.
• Incomplete Dominance: A situation where the phenotype of a heterozygote is intermediate between the two homozygous phenotypes.
• Sex-Linked Inheritance: Involves genes located on sex chromosomes, primarily affecting the inheritance patterns in males and females.

3. Analysis and Detail

In codominance, both alleles contribute to the organism's phenotype, making it the distinguishing characteristic. An example is AB blood type, where both A and B alleles are expressed without blending, contrary to incomplete dominance, where the resulting phenotype appears as a mix of the two traits.

4. Verify and Summarize

Given the definitions and explanations of these inheritance patterns, it is clear that codominance is the correct answer since it directly involves the equal expression of both alleles.

Final Answer

Codominance