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 550 bp band, where Variety R has 600 bp
   • Its 400 bp band
   • Its 950 bp band

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?

   • Plants A and C
   • Plant A
   • Plant C
   • Plant B
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?

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

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

   • 750 bp and 300 bp
   • 600 bp and 400 bp
   • Zero; each one matches the mother
   • 900 bp and 150 bp
7. 5.

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

   Use the picture in question 4.

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

8. Use this

   Model gel (not to scale; model data).

10. 6.

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

    • The calf's 300 bp band is in neither the mother's nor Bull Q's lane
    • The calf must match its mother alone
    • Bull Q has more bands than the calf
    • Bull Q shares the 650 bp band, so it must be the father
11. 7.

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

    Use the picture in question 6.

    • 700 bp and 200 bp
    • 1000 bp and 500 bp
    • Each of the four bands
    • 650 bp and 300 bp
12. 8.

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

    Use the picture in question 6.

    • Bull Q
    • Bull P
    • Neither bull
    • Both bulls
13. 9.

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

    Use the picture in question 6.

    • Below the 100 bp band
    • Between 300 bp and 100 bp
    • Between 1200 bp and 600 bp
    • Between 600 bp and 300 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 6.

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