The pair-rule gene fushi tarazu is expressed in the seven even-nu...

Question

The pair-rule gene fushi tarazu is expressed in the seven even-numbered parasegments during Drosophila embryogenesis. In contrast, the segment polarity gene engrailed is expressed in the anterior part of each of the 14 parasegments. Since both genes are active at similar times and places during development, it is possible that the expression of one gene is required for the expression of the other. This can be tested by examining expression of the genes in a mutant background—for example, looking at fushi tarazu expression in an engrailed mutant background, and vice versa.

Given the hierarchy of gene action during Drosophila embryogenesis, what might you predict to be the result of these experiments?

Accepted Answer

Hey, everyone. Let's take a look at this question together. Ushi Taraz is expressed in seven even numbered pair segments. While engrail is expressed in all 14 pairs segments, their interdependent expression can be tested by observing their expression in mutant backgrounds. Which of the following statements is most likely true based on the given information about gene expression inro soila embryogenesis is it answer choice? A Shizu is expressed in both even and odd numbered pair segments. Answer choice B engrail is expressed in the posterior part of each of the 14 pair segments. Answer choice C Terazo and Engrail are never expressed in the same pair segments or answer choice D. The expression of Shiraz is required for the expression of engrail. Let's work this problem out together to try to figure out which of the following statements is most likely true. So by using the information provided in the question about Fui Taraz and in Grail, let's try to determine which of the following statements is most likely true. Starting with answer choice A which says is expressed in both even and odd numbered pair segments. Well, we know that Fua is expressed in seven, even numbered pair segments. And it does not say anything about Shiraz being expressed in odd numbered pair segments, which means that answer choice A is incorrect answer. Choice B says that engrail is expressed in the posterior part of each of the 14 pair segments. And we note that engrail is expressed in all 14 pair segments. So answer choice B is a possible correct answer. But let's double check with answer choice C and D. Before we make our selection, answer choice C says that Shizu and Engrail are never expressed in the same pair of segments which we know that Shiraz is expressed in seven even numbered pair of segments. And engrail is expressed in all 14. So answer choice C is incorrect since they are both expressed in the same seven even numbered pair of segments. And lastly, answer choice D says that the expression of Shiraz is required for the expression of engrail, which we know that their expression is interdependent, which means that the expression of one is not required for the expression of the other. So answer choice D is incorrect. And the only statement here that is true is answer choice B engrail is expressed in the posterior part of each of the 14 pair segments. So answer choice B is the correct answer. I hope you found this video to be helpful. Thank you and goodbye.

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