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. 

Video transcript

Everyone. Let's take a look at this question together, a broad sense of heritability close to zero indicates that blank. So let's recall what we know about the broad sense of heritability to try to figure out what a broad sense of heritability close to zero indicates. So know that a broad sense of heritability measures the contribution of Jenna tip pick variance two total, you know, typical variance, meaning what is the proportion that the phenotype variance is attributed to the genotype pick variance? And so we can measure this as an H two value that is close to one or an H two value that is close to zero. And before we define what an H two value close to one or zero is, we can go ahead and eliminate. Answer choice is C and answer choices D because behavioral conditions have no impact on heritability. And so answer choice C and D are incorrect. And so we can recall from what we've learned about broad sense of heritability to say that an H two value that is close to one means that we have a little environmental impact, meaning that an H two value close to one is strictly Jenna typical impact and not on the environment. Whereas an H two value close to zero means that we have a major environmental impact because that H two value close to zero indicates that the environment had a major impact on the variation. Which means that answer choice B is the correct answer because when we have this H two value that is close to zero, it indicates major environmental impact to the total fanatic variance. And so answer choice B is the correct answer. I hope you found this video to be helpful. Thank you and goodbye.