Question 34

This is an example of incomplete dominance.

In this genetic scenario, the crossing of a red flower with a white flower resulting in a pink flower illustrates incomplete dominance, where neither allele is completely dominant over the other.

A) Incomplete dominance

This option is correct because incomplete dominance occurs when the phenotype of the heterozygote is intermediate between the phenotypes of the two homozygotes. In this case, the red and white flower alleles blend to produce a pink flower, demonstrating this genetic principle.

B) Codominance

Codominance is characterized by both alleles being fully expressed in the phenotype of the heterozygote, such as in blood type AB where both A and B antigens are present. Since the result here is a blend (pink) rather than distinct red and white traits, this option is incorrect.

C) Complete dominance

In complete dominance, one allele completely masks the effect of another in a heterozygote, resulting in a phenotype that resembles one of the homozygotes. The presence of a pink flower indicates that this is not the case, making this option incorrect.

D) Bi-dominance

Bi-dominance is not a standard term in genetics and does not refer to a recognized inheritance pattern. Therefore, this option is not applicable to the scenario described and is incorrect.

Conclusion

The correct answer is incomplete dominance, as it accurately reflects the blending of traits resulting in a pink flower from a red and white cross. All other options fail to describe the genetic interaction taking place in this example, highlighting the unique nature of incomplete dominance in inheritance patterns.