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
   • Below 100 bp
   • Between 1000 bp and 500 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
   • 700 bp
   • 450 bp
   • 1000 bp
5. 3.

   Model gel (not to scale; model data). Kira reads the apple gel. How many bands are in the lane for Tree 3?

   • 1
   • 3
   • 4
   • 2

6. 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.

8. 4.

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

   • The pieces with the most repeats
   • The largest pieces
   • The smallest pieces
   • Each piece travels the same distance
9. 5.

   In the tomato gel, which of the seed packet's bands ends nearest the bottom, by Luz's reading?

   Use the picture in question 4.

   • The bands stay at the wells
   • The 300 bp band
   • The 800 bp band
   • The 450 bp band
10. 6.

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

    Use the picture in question 4.

    • The wells push it down with pumps
    • DNA is negative and is pulled to the positive (+) end
    • Big pieces sink, like stones in water
    • DNA is positive and is pulled to the negative end
11. 7.

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

    Use the picture in question 4.

    • Plant B
    • No plant in the gel
    • Plant C
    • Plant A
12. 8.

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

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

13. 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.

14. 9.

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

    • Genes for eye or coat color
    • The proteins made from the DNA
    • Repeated stretches whose number of repeats varies
    • Genes that are the same in each animal
15. 10.

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

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