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 400 bp band
   • Its 550 bp band, where Variety R has 600 bp
   • No band; it is a full match with the Variety R lane
   • 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 B
   • Plant C
   • Plants A and C
5. 3.

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

   • Neither parent; it is new
   • Male Y
   • Male X
   • The mother
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
   • 900 bp and 150 bp
   • Zero; each one matches the mother
7. 5.

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

   Use the picture in question 3.

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

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
    • Bull Q shares the 650 bp band, so it must be the father
    • Bull Q has more bands than the calf
    • The calf must match its mother alone
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.

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

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

    Use the picture in question 6.

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

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

    • The mother's and the puppy's, at 150 bp
    • Male Y's, at 850 bp
    • Male X's, at 200 bp
    • Male X's, at 750 bp
14. 10.

    Model gel (not to scale; model data). Using the cow gel, which band in the four sample lanes is largest, by Ari's reading?

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