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?

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

   • Plant A
   • Plant C
   • Plants A and C
   • Plant B
5. 3.

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

   • The mother
   • Male Y
   • Male X
   • 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.

   • Zero; each one matches the mother
   • 600 bp and 400 bp
   • 900 bp and 150 bp
   • 750 bp and 300 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's 300 bp band is in neither the mother's nor Bull Q's lane
   • Bull Q has more bands than the calf
   • Bull Q shares the 650 bp band, so it must be the father
   • The calf must match its mother alone
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.

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

    • Bull P
    • Neither bull
    • Both bulls
    • Bull Q
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?

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