What is the phenotype of maternal-effect mutations?

Video transcript

Hey, everyone. Let's take a look at this question together, female Drosophila that are blank for deleterious recessive mutations of maternal effect genes are sterile. So let's try to figure out which of the following gina types would cause the female Drosophila to be sterile due to deleterious recessive mutations of the maternal effect genes. So we know that when the female Drosophila are sterile, it means that they have a mutation in the maternal effect jeans. And we also know that this mutation is a deleterious recessive mutation, which means that in order for these female Drosophila to be sterile, they have to express two recessive traits since the deleterious mutation is recessive, which means they have to be home as a guest or that recessive mutation. So, answer choice B is the correct answer because when the female Drosophila are homos, I guess for that deleterious recessive mutation, it means that none of their embryos received the wild type maternal gene and so they end up becoming sterile. So, answer choice B is the correct answer. I hope you found this video to be helpful. Thank you and goodbye.