The diagrams show two models of plants being crossed.

Question

Which statement correctly describes the patterns of dominance represented in each model?

a
Model W shows a pattern of codominance, whereas model X shows a pattern of incomplete dominance.
b
Model W shows a pattern of incomplete dominance, whereas model X shows a pattern of codominance.
c
Model W shows a pattern of incomplete dominance, whereas model X shows a pattern of complete dominance.
d
Model W shows a pattern of complete dominance, whereas model X shows a pattern of incomplete dominance.

Answer 1

To answer this question, we need to understand the definitions of codominance, incomplete dominance, and complete dominance:

• Complete Dominance: In this pattern, one allele completely masks the effect of another allele. The phenotype of the heterozygote is the same as the phenotype of the homozygous dominant.

• Incomplete Dominance: In this case, neither allele is completely dominant over the other. The phenotype of the heterozygote is a blend or intermediate of the phenotypes of the two homozygotes.

• Codominance: In codominance, both alleles in a heterozygote are fully expressed, resulting in a phenotype that shows both traits simultaneously.

Without the diagrams available, I can provide guidance on how to interpret the models:

1. Check Model W: Look for blending of traits (incomplete dominance) or both traits being expressed (codominance).
2. Check Model X: Look for whether one trait masks another (complete dominance) or if both traits are expressed equally (codominance).

Once you analyze the models with this information in mind, you can select the correct statement from the options presented. Without the visual information, I cannot definitively choose the correct answer for you.

If you can describe the models or the outcomes of the crosses, I would be happy to help you determine which statement is accurate!