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Ch. 47 - Animal Reproduction and Development
All textbooksFreeman 8th EditionCh. 47 - Animal Reproduction and DevelopmentProblem 7
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Chapter 46, Problem 7

What is the connection between genetic regulatory cascades and the observation that differentiation is a step-by-step process?

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Hi everyone. Let's look at our next question. It says sell blank refers to the process when a cell changes from one type to differentiated one. While jean blank is a process of gene activation. So let's start with our first blank here. We were looking for the process when a cell changes from one type to a differentiated one. Well this is the process of differentiation. A cell becoming specialized to a specific function in the body. And when we look at our answer choices, we see the only choice C. Has differentiation in the first place. So that is going to focus in on choice C is most likely are correct answer. So we'll just double check the second word here. Our problem says while gene blank is the process of gene activation. Well, the process of gene activation occurs when a gene begins to be expressed and we can recall that gene expression is when the information stored in DNA is converted into instructions for making proteins. So gene expression is that process of gene activation. And we see that indeed in choice C expression is our second term. So our answer here will be choice See but we can just walk through the other choice is to understand why they're not correct. Choice A has cell activation. Um Well activation is a term we want for gene activation when a gene begins to be expressed rather than cell activation. So that's not correct. Choice B says cell division. Well, cell division is just that process of replica cell replicating itself by dividing into daughter cells. So not the process of differentiation. so that's another correct answer. And finally, Choice D. Has cell apoptosis. That's that process of programmed cell death. So not a process of changing to a specialized type. So Choice D. Is not our correct answer. So again, so choice see differentiation refers to the process when a cell changes from one type to differentiated one, while gene expression is the process of gene activation. See you in the next video.
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Textbook Question

The following predictions ask you to consider how genetic regulatory cascades provide positional information. Select True or False for each statement. T/F Mutation of a gene at one level of a regulatory cascade will affect the expression of genes at all levels of the cascade. T/F Mutation of a gene that is expressed later in a regulatory cascade will affect a smaller region of the body than mutation of gene that is expressed early in the cascade. T/F In the regulatory cascade used by Drosophila, a gene at one level of the cascade will be controlled only by genes at the level immediately above it. T/F Genes that control the largest regions of the Drosophila embryo are not transcribed in the embryo.

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