How does a trait with incomplete dominance differ from a trait with complete dominance?

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BlackTom AI · Accepted Answer

Topic focus: comparing incomplete dominance with complete dominance in trait expression.
Option 1: 'The heterozygous genotype has a unique phenotype in the case of incomplete dominance' — This is correct. In incomplete dominance, the heterozygote displays an intermediate phenotype that is distinct from both homozygous phenotypes, reflecting a blending effect.
Option 2: 'In the case of incomplete dominance there is no heterozygote genotype' — This is false. There is a heterozygote genotype (e.g., Aa), and its phenotype is key to distinguishing incomplete dominance from complete dominance.
Option 3: 'There is no difference in the trait expression between these two types of dominance' — This is incorrect. The trait expression differs: incomplete dominance produces an intermediate phenotype in the heterozygote, whereas complete dominance typically has the heterozygote resemble the dominant homozygote.
Option 4: 'The homozygous dominant and heterozygotes express the same phenotype in the case of incomplete dominance' — This is false. In incomplete dominance, the heterozygote does not match the homozygous dominant phenotype; instead, it shows an intermediate phenotype.
Overall, the first option accurately captures the defining distinction of incomplete dominance compared with complete dominance, while the other options misstate heterozygote presence or the nature of phenotype expression.

AGRI10051_2025_SM2 Exam: Genetics for Agriculture (AGRI10051_2025_SM2)- Requires Respondus LockDown Browser

How does a trait with incomplete dominance differ from a trait with complete dominance?

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