The following variances were calculated for two traits in a herd of hogs.

  Trait             Vₚ           VG        VA  _
Back fat        30.6        12.2       8.44
Body length  52.4        26.4     11.70

Which of the two traits will respond best to selection by a breeder? Why?

Video transcript

Hey everyone. Let's take a look at this question together. The ratio of additive genetic variance to total phenotype. IQ variance is the narrow sense heritability. It is calculated using which of the following formulas. So let's recall what we know about the narrow sense heritability formula to try to figure out which one of the falling represents that. So we know that when we're talking about a ratio comparing two different things in this case that additive genetic variants and the total fanatic variants, we know that we're looking at a formula contain division. For example if we have the ratio of X to Y. It would look like this or A to B. Would look like this so we can automatically cross off answer choice B since it contains the addition and not division of two different variables. And looking at the different types of variables. We know that V. Sub G. Is the total genetic variants, VISA P. Is the total in a typical variants, you know, typical variance. And then lastly Visa A. Is that additive genetic variance? And so looking at the following answer choices. Which one best represents the division of that additive genetic variance and total fanatic variants of Visa A. And Visa P. And we can see that answer choice C best represents the narrow sense heritability formula because we have that narrow sense heritability and then we have the division of Visa A VISA P. Which is that additive genetic variance divided by that total fanatic variants, which is the ratio of both variables. And so answer choice. C is the correct answer. I hope you found this video to be helpful, Thank you and goodbye.