Why do co-dominant alleles NOT produce simple Mendelian ratios? (A) Both alleles are expressed in the phenotype. (B) Neither allele is expressed in the phenotype. (C) The recessive allele is only expressed in the homozygous genotype. (D) The expression of the dominant allele is affected by the recessive allele.

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Why do co-dominant alleles NOT produce simple Mendelian ratios? (A) Both alleles are expressed in the phenotype - HSC - SSCE Biology - Question 10 - 2014 - Paper 1

Question 10

Why do co-dominant alleles NOT produce simple Mendelian ratios? (A) Both alleles are expressed in the phenotype. (B) Neither allele is expressed in the phenotype. ... show full transcript

Worked Solution & Example Answer:Why do co-dominant alleles NOT produce simple Mendelian ratios? (A) Both alleles are expressed in the phenotype - HSC - SSCE Biology - Question 10 - 2014 - Paper 1

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Why do co-dominant alleles NOT produce simple Mendelian ratios?

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Answer

Co-dominance occurs when both alleles in a heterozygote are fully expressed, resulting in a phenotype that displays characteristics of both alleles. This contrasts with complete dominance, where one allele masks the expression of the other. Therefore, in the case of co-dominance, you do not achieve the classic 3:1 or 1:2:1 ratios observed in Mendelian genetics.

Thus, the correct answer is:

(A) Both alleles are expressed in the phenotype.

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