Floral traits in plants often play key roles in diversif...

Question

Floral traits in plants often play key roles in diversification, in that slight modifications of those traits, if genetically determined, may quickly lead to reproductive restrictions and evolution. Insight into genetic involvement in flower formation is often acquired through selection experiments that expose realized heritability. Lendvai and Levin (2003) conducted a series of artificial selection experiments on flower size (diameter) in Phlox drummondii. Data from their selection experiments are presented in the following table in modified form and content.

Considering that differences in control values represent year-to-year differences in greenhouse conditions, calculate (in mm) the average response to selection over the three-year period. <>

Accepted Answer

Hi everyone. Let's take a look at this practice problem together. A palla genic trait has a variable frequency of occurrence depending on the season. This indicates the effect of which of the following factors on the trait variation. Recall that palla genic traits are those that are controlled by two or more genes. So in this question the trait has variable frequency depending on the season, which means that the phenotype has variability. So recall that there's a formula that talks about phenotype IQ variants and the phenotype pick variance equals the gina tip pick variance plus the environmental variants. Having reviewed all of that. Let's look at our options. We've got a genetic Now the effect of seasons on phenotype is not genetic. Therefore a is incorrect. We're going to talk about C behavioral. This is not a factor that influences phenotype variance. It's only Jenna tip IQ and environmental and so C. Is also incorrect because A. And C. Are incorrect. That makes D all of the above also an incorrect answer. So our answer therefore has to be option B. Environmental is the effect on the trait variation. It's the type of factor that affects the trait variation. Alright, everybody, I hope you found this helpful and I'll see you soon for the next practice problem

Key Concepts

Heritability

Artificial Selection

Response to Selection

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