Match samples with a DNA fingerprint

Grade 9 Science Worksheet

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.

2. 1.

   Using the tomato gel, a second seed packet's sample shows bands at 700, 450 and 250 bp. Which plant matches it, by Esme's reading?

   • Plants A and C
   • Plant C
   • Plant B
   • Plant A
3. 2.

   Model gel (not to scale; model data). Using the apple gel, how many trees can be ruled out as Variety R, by Jun's reading?

   • 1 tree: just Tree 3
   • 3 trees
   • 2 trees: Tree 2 and Tree 3
   • 0 trees; each one shares bands
5. 3.

   Using the dog gel, where did the puppy's 900 bp band come from, by Kira's reading?

   • Male X
   • Male Y
   • The mother
   • Neither parent; it is new
6. 4.

   Using the dog gel, which of the puppy's bands are not in the mother's lane, by Luz's reading?

   Use the picture in question 3.

   • 600 bp and 400 bp
   • 750 bp and 300 bp
   • Zero; each one matches the mother
   • 900 bp and 150 bp

7. Use this

   Model gel (not to scale; model data).

9. 5.

   Using the cow gel, why can Bull Q be ruled out as the calf's father, by Noah's reading?

   • The calf must match its mother alone
   • Bull Q has more bands than the calf
   • The calf's 300 bp band is in neither the mother's nor Bull Q's lane
   • Bull Q shares the 650 bp band, so it must be the father
10. 6.

    Using the cow gel, which of the calf's bands came from its mother, by Pia's reading?

    Use the picture in question 5.

    • 650 bp and 300 bp
    • Each of the four bands
    • 1000 bp and 500 bp
    • 700 bp and 200 bp
11. 7.

    Using the cow gel, which bull could be the calf's father, by Ren's reading?

    Use the picture in question 5.

    • Both bulls
    • Bull Q
    • Neither bull
    • Bull P
12. 8.

    Using the dog gel, which lane has its smallest band nearest the bottom, by Tala's reading?

    • Male X's, at 750 bp
    • The mother's and the puppy's, at 150 bp
    • Male Y's, at 850 bp
    • Male X's, at 200 bp

13. Use this

    Model gel (not to scale; model data).

15. 9.

    Using the cow gel, between which ladder bands does Bull P's 550 bp band sit, by Zee's reading?

    • Below the 100 bp band
    • Between 1200 bp and 600 bp
    • Between 600 bp and 300 bp
    • Between 300 bp and 100 bp
16. 10.

    Using the cow gel, which band in the four sample lanes is largest, by Ari's reading?

    Use the picture in question 9.

    • The 100 bp band, farthest down
    • The 300 bp band, in the middle
    • The 1000 bp band, nearest the wells
    • The 1200 bp band, from the ladder