Question

question 4
think about homozygous blue (b¹b¹), homozygous red (b²b²), and heterozygous purple(b¹b²) flowers. in this plant, what type of inheritance pattern is described by this?

• codominance
• epistasis
• incomplete dominance
• simple dominance
• polygenic inheritance

Explanation:

• Codominance: Both alleles are fully expressed in the heterozygote. Here, \(B^{1}\) (blue) and \(B^{2}\) (red) would show both colors if it were codominance (like a flower with blue and red patches).
• Epistasis: One gene masks the expression of another gene. There is no indication of gene - gene interaction of this type in the problem.
• Incomplete dominance: The heterozygote has a phenotype intermediate between the two homozygotes. The purple color (\(B^{1}B^{2}\)) is an intermediate between blue (\(B^{1}B^{1}\)) and red (\(B^{2}B^{2}\)).
• Simple dominance: One allele completely masks the other. But here, the heterozygote is not showing the phenotype of one of the homozygotes (not just blue or just red).
• Polygenic inheritance: Multiple genes contribute to a trait. The problem mentions a single - gene (with two alleles) situation.

Answer:

incomplete dominance