Erma and Harvey were a compatible barnyard pair, but a curious sight. Harvey's tail was only 6 cm long, while Erma's was 30 cm. Their F₁ piglet offspring all grew tails that were 18 cm. When inbred, an F₂ generation resulted in many piglets (Erma and Harvey's grandpigs), whose tails ranged in 4-cm intervals from 6 to 30 cm (6, 10, 14, 18, 22, 26, and 30). Most had 18-cm tails, while 1/64 had 6-cm tails and 1/64 had 30-cm tails. Explain how these tail lengths were inherited by describing the mode of inheritance, indicating how many gene pairs were at work, and designating the genotypes of Harvey, Erma, and their 18-cm-tail offspring.

Video transcript

Everyone. Let's take a look at this question together. What is true about heritability among the following statements. So let's take a look at the following statements and recall what we've learned about heritability to figure out which one is true. Starting off with answer choice A. It says heritability is determined by an individual's genes alone. We know that this is incorrect because heritability is not just determined by an individual's genes but also it can be influenced bye environmental factors. So answer choice A. Is incorrect answer choice B says heritability is always 100%. We know that this is also incorrect because it is not always 100% because of those other factors influencing percentage. Answer choice C says heritability can change based on environmental factors which we know is a true statement because it can be influenced by those environmental factors. So answer choice C. Is a true statement. But let's check out answer choice D Before we go ahead and make our selection answer choice D. Says heritability applies only to genetic traits which we know is incorrect because it's not only to genetic traits because it is a population level concept and genetic factors contribute to that variation within a population And it is not only applied to genetic traits. So answer choice C. is the only statement here about heritability that is true because we know that it can change based on those environmental factors since it is not determined by an individual's genes alone and that heritability is not always 100% because other factors including those environmental factors can influence that percentage and it does not apply only to genetic traits. So answer choice C. Is the correct answer. I hope you found this video to be helpful. Thank you and goodbye.