Alleles both have an effect on the phenotype heterozygous organism
Correct answer: A. Codominance
- A. Codominance
- B. Incomplete dominance
- C. Dominance
- D. Recessive
Explanation
This is the correct answer. Codominance occurs when both alleles of a heterozygous individual are expressed simultaneously in the phenotype. Neither allele is dominant over the other, and both contribute equally to the observed trait. A classic example of codominance is the ABO blood type system, where the IA and IB alleles are codominant.
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About Inheritance
Mendel's laws explain segregation, independent assortment and the prediction of genetic ratios using alleles, genotypes and phenotypes. The chapter also covers linked genes, recombination and crossing over during meiosis, then applies pedigree reasoning to X-linked recessive traits, which show different inheritance patterns in males and females.
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