Match samples with a DNA fingerprint

Grade 9 Science Worksheet - Building Confidence

Circle the best answer.

1. Read this first

   Use this

   Model gel (not to scale; model data). Wells at the top, next to the negative (-) end. The positive (+) end is at the bottom. Ladder lane, top to bottom: 1000, 500, 250, 100 bp. Seed packet sample, bands: 800, 450, 300 bp. Plant A, bands: 800, 450, 300 bp. Plant B, bands: 700, 450, 250 bp. Plant C, bands: 800, 350, 300 bp.

3. 1.

   Ari reads the tomato gel. Which ladder bands is the seed packet's top band, at 800 bp, between?

   • Above 1000 bp
   • Between 1000 bp and 500 bp
   • Below 100 bp
   • Between 250 bp and 100 bp, near the bottom
4. 2.

   Bo reads the tomato gel. Plant B has a band between the 500 bp and 250 bp ladder bands. Which size fits it?

   Use the picture in question 1.

   • 150 bp
   • 1000 bp
   • 700 bp
   • 450 bp
5. 3.

   In a gel, which DNA pieces travel farthest from the wells, by Jun's reading (OpenStax)?

   Use the picture in question 1.

   • The smallest pieces
   • The largest pieces
   • The pieces with the most repeats
   • Each piece travels the same distance
6. 4.

   Why does DNA move down the gel toward the bottom, by Milo's reading (OpenStax)?

   Use the picture in question 1.

   • DNA is positive and is pulled to the negative end
   • Big pieces sink, like stones in water
   • DNA is negative and is pulled to the positive (+) end
   • The wells push it down with pumps
7. 5.

   Using the tomato gel, which plant's pattern matches the seed packet sample, by Noah's reading?

   Use the picture in question 1.

   • No plant in the gel
   • Plant A
   • Plant B
   • Plant C
8. 6.

   Model gel (not to scale; model data). Using the apple gel, which tree matches the Variety R reference, by Pia's reading?

   • Tree 2
   • Tree 1
   • Trees 2 and 3
   • Tree 3

9. Use this

   Model gel (not to scale; model data). Wells at the top, next to the negative (-) end. The positive (+) end is at the bottom. Ladder lane, top to bottom: 1000, 500, 250, 100 bp. Seed packet sample, bands: 800, 450, 300 bp. Plant A, bands: 800, 450, 300 bp. Plant B, bands: 700, 450, 250 bp. Plant C, bands: 800, 350, 300 bp.

11. 7.

    In the tomato gel, Plant C shares two bands with the seed packet. Is it a match, by Ren's reading?

    • No; its 350 bp band does not line up with the 450 bp band
    • Yes; most of its bands line up
    • No; it has fewer bands than the sample
    • Yes; two shared bands are enough for a match
12. 8.

    What is a DNA fingerprint, by Tala's reading (OpenStax)?

    Use the picture in question 7.

    • The pattern of ridges on an animal's paw
    • The band pattern copied from the mother alone
    • A list of the genes that set an animal's traits
    • The unique band pattern an individual's cut DNA makes on a gel
13. 9.

    Which DNA regions often make fingerprint bands differ, by Zee's reading (OpenStax)?

    Use the picture in question 7.

    • Repeated stretches whose number of repeats varies
    • Genes for eye or coat color
    • Genes that are the same in each animal
    • The proteins made from the DNA
14. 10.

    Where does an offspring's DNA come from, by Esme's reading (OpenStax)?

    • The whole of it from the mother
    • The whole of it from the father
    • One copy of each chromosome from each parent
    • Half its chromosomes from each grandparent alone