Non-Mendelian Genetics

AP Biology· difficulty 2/5

In codominance, the heterozygote

  • A

    Expresses only the dominant allele while masking the recessive allele entirely

  • B

    Expresses neither allele due to silencing of both parental gene copies

  • C

    Expresses both alleles' phenotypes simultaneously (e.g., AB blood type)

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  • D

    Shows a blended intermediate phenotype between the two homozygotes (e.g., pink flowers)

Explanation

Both alleles are fully expressed in the phenotype (e.g., A and B antigens both present in AB blood).

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