Match samples with a DNA fingerprint

Grade 9 Science Worksheet

Circle the best answer.

1. 1.

   Model gel (not to scale; model data). Using the apple gel, Tree 2 differs from Variety R at one band. Which band, by Bo's reading?

   • No band; it is a full match with the Variety R lane
   • Its 400 bp band
   • Its 950 bp band
   • Its 550 bp band, where Variety R has 600 bp

2. 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. 2.

   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?

   • Plant B
   • Plants A and C
   • Plant C
   • Plant A
4. 3.

   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?

   • 2 trees: Tree 2 and Tree 3
   • 3 trees
   • 0 trees; each one shares bands
   • 1 tree: just Tree 3
6. 4.

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

   • Male X
   • The mother
   • Male Y
   • Neither parent; it is new
7. 5.

   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 4.

   • Zero; each one matches the mother
   • 750 bp and 300 bp
   • 900 bp and 150 bp
   • 600 bp and 400 bp
8. 6.

   Using the dog gel, which male could be the puppy's father, by Milo's reading?

   Use the picture in question 4.

   • Male Y, since it shares no bands with the mother
   • Male X, which has the 750 bp and 300 bp bands
   • Neither male
   • Either male, since puppies match the mother
9. 7.

   Model gel (not to scale; model data). Using the cow gel, which bull could be the calf's father, by Ren's reading?

   • Bull P
   • Both bulls
   • Neither bull
   • Bull Q
10. 8.

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

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

11. Use this

    Model gel (not to scale; model data).

13. 9.

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

    • Between 300 bp and 100 bp
    • Between 600 bp and 300 bp
    • Below the 100 bp band
    • Between 1200 bp and 600 bp
14. 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 1200 bp band, from the ladder
    • The 1000 bp band, nearest the wells
    • The 300 bp band, in the middle
    • The 100 bp band, farthest down