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Grade 9 DNA Basics Fill in the Blanks Worksheet

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📄 Grade 9 DNA Basics Fill in the Blanks Worksheet

DNA Basics Practice — How the Pieces Fit

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Try these before or after you print the worksheet. The printable asks you to fill in the words; this asks how they fit inside one another, which is where the words on their own can mislead.

Question 1 — put them in order

Click these in order, from the smallest to the largest.

Part	What it is
Gene	A section of DNA that controls one characteristic.
Chromosome	A long piece of DNA, carrying many genes.
Nucleus	The part of the cell that holds the chromosomes.
Cell	The whole living unit, with the nucleus inside it.

Question 2

Sections of DNA that control characteristics are called:

Question 3

Where in the cell is DNA found?

Question 4

DNA has a double helix shape. What does that look like?

Question 5 — select all that apply

Select every statement that is true of DNA, then press Check.

Question 6 — spot the mistake

A student says: “Genes and chromosomes are the same thing.” What went wrong?

Question 7

Every cell in your body has the same DNA. So why is a skin cell different from a muscle cell?

Think about it

If a gene is a section of a chromosome, and a chromosome is in the nucleus, where is the gene?
DNA provides instructions for building proteins. What might happen if one instruction were copied wrongly?
You inherited DNA from both parents. Why do you not look exactly like either of them?
Why is it useful that every cell carries a complete copy, rather than only the part it needs?