Question Video: Understanding the Technique of Somatic Cell Nuclear Transfer to Create Clones | Nagwa Question Video: Understanding the Technique of Somatic Cell Nuclear Transfer to Create Clones | Nagwa

Question Video: Understanding the Technique of Somatic Cell Nuclear Transfer to Create Clones Biology • Third Year of Secondary School

The two sheep in the figure shown were used in a somatic cell nuclear transfer procedure. Eggs were obtained from sheep 1, and skin cells were obtained from sheep 2. What would the genetic makeup of the offspring produced by this process be?

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Video Transcript

The two sheep in the figure shown were used in a somatic cell nuclear transfer procedure. Eggs were obtained from sheep 1, and skin cells were obtained from sheep 2. What would the genetic makeup of the offspring produced by this process be? (A) The offspring would be genetically identical to sheep 1. (B) The offspring would be completely white in color. (C) The offspring would be genetically identical to sheep 2. (D) The offspring would be genetically different to sheep 1 and sheep 2. Or (E) the offspring would be completely black in color.

This question asks us about a procedure called somatic cell nuclear transfer. So, what is this procedure and how does it work? Somatic cell nuclear transfer, also called renucleation, is a form of artificial reproduction, which is the creation of new life in ways that are not natural. It is a technique that can be used to produce genetically identical copies of animals or clones. There are multiple steps in this process. Let’s remove our answer choices for now so we have more space to go over the stages in the process in the context of this question.

First, the nucleus is removed from a skin cell that has been obtained from sheep 2. Then, the egg cell that has been obtained from sheep 1 is enucleated. This means the nucleus is removed from the cell. The skin cell nucleus from sheep 2 is inserted into the enucleated egg cell from sheep 1. The result is an embryo that can then be transferred to a surrogate sheep, where it can implant and develop.

The lamb born as a result, sheep 3 in our diagram, will be genetically identical to sheep 2. This is because the genetic material of a eukaryotic organism is found in the nucleus. The egg cell from sheep 1 now contains the genetic information from sheep 2. The genetic information will determine many of the characteristics and features of the offspring. So, we would expect the offspring to share the physical features of sheep 2, for example, a white fleece and brown face.

We now have enough information to answer our question correctly. So, let’s bring back our answer choices. The correct answer is (C). The offspring would be genetically identical to sheep 2.

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