Dolly the Sheep

What did scientists remove from the egg cell of a sheep

• the nucleus

• the embryo

• DNA

• udder cells

As part of the process of cloning a sheep, scientists joined the egg cell to an udder cell using electricity. Based on this evidence, what conclusion can be made?

• Cloning a sheep requires many egg cells.

• It there are enough udder cells, no egg cell is required to clone a sheep

• Both an egg cell and an udder cell are needed to clone a sheep.

• A sheep can be cloned using only an udder cell.

This passage describes the sequence of events involved in cloning a sheep. What happened after the egg cell developed into an embryo?

• The egg cell was joined to an udder cell using electricity

• The embryo was placed inside another sheep.

• Scientists took udder cells from Dolly's DNA mother.

• Scientists removed the nucleus from the egg cell.

Tags

NGSS.HS-LS1-4

Based on the information in the text, what can you infer about the process of cloning a sheep?

• Cloning cannot be done more than once.

• Cloning a sheep can happen overnight.

• Cloning does not happen naturally in sheep.

• Cloning is the easiest way to produce sheep.

What is the main idea of this text?

• An embryo is the early stage of an animal before it has been born or hatched.

• Dolly’s DNA mother provided the udder cells that helped scientists make Dolly.

• Scientists cloned a sheep using udder cells from one sheep and an egg cell from another

• Udder cells and egg cells can be joined together using an electric current.

In describing the steps in the process of cloning a sheep, the author includes pictures with labels and captions in addition to the text. Why might the author have included these pictures?

• to show the actual size of an egg cell, udder cell, and embryo

• to illustrate the meaning of words or concepts that are explained in the text

• to highlight information that is not part of the process of cloning a sheep

• to fill up the space so that the author would not have to include more text

Choose the answer that best completes the sentence: "The udder cell and the egg cell were joined using electricity. ___________, the egg cell contained all the udder cell’s DNA."

• As a result

• On the other hand

• However

• Instead

Tags

NGSS.HS-LS3-2