What is the connection between genetic regulatory cascades and th...

Question

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

Accepted Answer

Welcome back. Let's look at our next question. It says what is the connection between gene expression and cell differentiation? Well this morning can be maybe a little vague, a little hard to understand what's being looked for. So it's good to look over the answer choices and we see that there's answer choices involving um whether different cell types have different genes or the same genes and how they're expressed. So let's just work through the answer choices. Choice A. Says in different cell types, genes are activated and expressed although they have the same set of genes and this is correct. Every cell in your body has the same set of genes but different genes in each type of cell are activated and then transcribed and others are turned off in different types of cells. So even though all cells have the same set of genes, that's how they become different, differentiate from each other. So gene expression differential gene expression is what allows cells to differentiate. Choice A. Is correct. But let's just look through the other answer choices. Choice B says different cell types vary in gene composition and therefore vary in gene expression. Well this is not correct. They do not vary in gene composition. Every cell type has the same genome in it. So Choice B is not correct. Joyce E. Says in different cell types some genes are deleted to prevent overlapping. While this is not correct. The cells retain that complete set of genes. They just have some turned off or not expressed. So Choice C. Is not correct. And finally, Choice D says cell expression is consistent across all cell types. Well, that's not correct. Different cell types express different genes and silence others, so Choice D. Is not our answer. And again, the connection between gene expression and cell differentiation is Choice A. In different cell types, genes are activated and expressed, although they have the same set of genes. Hope that helps you in the next video.

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

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