Classroom Questions

Questions for “Some identical twins don’t have the exact same DNA”

twin girls

Identical twins were thought to be genetically the same. However, a new study finds that’s not always true.

Kumacore/Getty Images Plus

By Science News Explores

To accompany “Some identical twins don’t have the exact same DNA”

SCIENCE

Before Reading:

1.  What’s the main difference between fraternal and identical twins?

2.  What explains why “identical” twins usually look identical?

During Reading:

1.  What are monozygotic twins?

2.  What’s the difference in how these and dizogotic twins develop?

3.  Why have many genetics studies recruited identical twins as their subjects?

4.  In the past, to what had scientists attributed any genetic differences in identical twins?

5.  In the new study, how many twins were truly identical down to the genetic level?   

6.  How greatly did some of the other twins vary, genetically?

7.  What are mutations?

8.  To what do scientists now attribute those mutations? For instance, when did they likely occur?

After Reading:

1.  On a percentage basis, what share of twins in the new study were genetically identical? What share had more than 100 genetic differences? Show your work.

Use up and down arrow keys to explore.Use right arrow key to move into the list.Use left arrow key to move back to the parent list.Use tab key to enter the current list item.Use escape to exit the menu.Use the Shift key with the Tab key to tab back to the search input.