Consider the even-skipped regulatory sequences in the followin...

Question

Consider the even-skipped regulatory sequences in the following figure:

How are the sharp boundaries of expression of Eve Stripe 2 formed?

Diagram showing even-skipped gene enhancers, repressors, activators, and gap gene expression patterns forming Eve Stripe 2 boundaries. Diagram showing how activators Bicoid and Hunchback promote eve stripe 2 expression, while repressors Giant and Krüppel prevent expression in adjacent regions.

Accepted Answer

Hey, everyone. Let's take a look at this question together. One characteristic of the eve regulatory sequence that contributes to the sharp boundaries of expression observed in the embryo is the presence of multiple blank elements including enhancers and silencers that interact with transcription factors and other proteins to regulate gene expression. Is it answer choice. A repeat tandem elements, answer choice B, single nucleotide polymorphism elements, answer choice C micro satellite elements or answer choice D cys regulatory elements. Let's work this problem out together to try to figure out which of the following answer. Choices are those elements that interact with transcription factors and other proteins to regulate gene expression. So we know that the presence of a multiple type of elements which include enhancers and silencers interact with transcription factors as well as other proteins to regulate gene expression. And we know that enhancers and silencers are a type of this regulatory sequences. Since we know that enhancers are sequences to increase the activity of a gene when interacting with transcription factors. Whereas a silencer causes that decrease in gene activity. And since these enhancers in silencers are a type of CS regulatory sequences, we could say that one characteristic of the eve regulatory sequence that contributes to the sharp boundaries of expression observed in the embryo is the presence of multiple CS regulatory elements which include those enhancers and silencers that interact with transcription factors to regulate gene expression. So, answer choice DC regulatory is the correct answer since it correctly fills in the blank because those cyst regulatory elements are elements that interact with inscription factors to regulate the expression. For example, increasing gene expression with those enhancers or decreasing gene expression with the silencers. So answer choice DC regulatory is the correct answer. I hope you found this video to be helpful. Thank you and goodbye.

Consider the even-skipped regulatory sequences in the following figure:
How are the sharp boundaries of expression of Eve Stripe 2 formed?

Key Concepts

Gene Regulatory Sequences

Transcription Factor Gradients and Combinatorial Control

Enhancer-Mediated Spatial Patterning

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