Phone: (519) 746-4761

Canadian Address:

169 Lexington Court, Unit I

Waterloo, ON, N2J 4R9


US Address:

Niagara Falls, NY 14305

Canadian/International ship from Waterloo; US orders from Buffalo, NY.

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12 Base Pair DNA Model

This 3D DNA model mimics the original Watson Crick version with major/minor grooves, anti-parallel strands & base complementarity. Read our blog on why this is our best DNA Double Helix Teaching Tool.

If that's not convincing enough, read this review/testimonial by a teacher whose school bought 10 of them over the years.

SKU: 68795WS
Orbit 12 base pair DNA model, needs assembly

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Current Reviews: 1

When used as part of a lab exercise, it is highly effective for illustrating the major features of the double helix as well as explaining the basics of DNA forensics identification techniques. 12 base pairs is enough to show 1 full turn & is sufficient to illustrate the nature of unique DNA sequences needed for forensic analysis.

This model has been training molecular biologists since 1997. Among our many customers: U. Toronto, Harvard, MIT, NYU, U. Minnesota, Wayne State, U. Illinois, Caltech, US Naval Academy, Stanford & many more.

TV & movie appearances include the Fantastic Four & Stargate Atlantis!

  • 1 hr. molecular biology lab for 24 students for as little as $0.10/student
  • Can be built & disassembled repeatedly
  • Over 1 million possible combinations
  • Use as stand-alone, display model
  • Stands ~1m (3') tall
  • 1 turn; 12 base pairs; 6 each AT & GC
  • Assembly guide sent by e-mail
  • Base not as shown: 2 unstained wood pieces for "X" base support
  • Major/minor grooves stand out
  • Special double bonds show antiparallel structure
  • Alpha helix fits major groove (not included)


Click here for related information or images

24 Base Double Height Version, AT, CG, Deoxyribose, GC, GC-AT, Phosphate, TA, TA-CG,
68218CAtom, Orbit, O, red, 1 prong85
68230CAtom, Orbit, O, 110 degree, red125
68235CAtom, Orbit, C, planar:108-120-132, black25
68236CAtom, Orbit, C, planar: 108-126-126, black25
68237CAtom, Orbit, N, planar: 108-126-126, blue30
68241CAtom, Orbit, C, planar: 120-120-120, black75
68242CAtom, Orbit, N, planar: 120-120-120, blue70
68244CAtom, Orbit, C, tetrahedral, black135
68247CAtom, Orbit, P, tetrahedral, purple24
68267CAtom, Orbit, double/triple bond peg/insert211
68186-20Wobbly bond, 20mm, each438
68186-25Wobbly bond, 25mm, each98
68366Orbit bonds, opaque, 20mm, 15/bundle7
67288CBond, Minit, white, 210mm5
68186-50Wobbly bond, 50mm, each30
68795LAYPlastic layer12
68795WBDNA wooden base for 12 Lyr Kit1
68795spacerAcrylic tube spacer (Orbit)11

4 Stars 2016-12-02

-Early Adopter
This model is fantastic but is not for the faint of heart. I had students assemble it in class as part of our unit on nucleic acid structure. It took two classes, an occasional bored research group member, and an awful lot of quality control on my part to actually finish it! The most difficult part is figuring out what tubes to use for what bonds. It is of course obvious if one sits all of the different lengths next to one another along with a description of the different bond lengths in DNA, but some of the tubes are close enough in length that they were initially used interchangeably by the students. The model is accurate enough that if the wrong bond lengths are used for any pieces, it doesn't fit together correctly. That was a good teaching moment:-) Once we got that figured out, it was smooth sailing. The model is ideal for teaching everything from base pairing to major and minor grooves. Besides, it looks pretty cool in my office. I'd buy it again.

Thanks for the feedback. The instructions were written by the prof who designed the DNA model but they are nearly 20 years old & have some obvious shortcomings! The good news is we have engaged an exceptional high school teacher with exceptional students who are rewriting the material for us. Your concerns will be addressed in this iteration. As soon as it is done, we will announce this on the website & send copies to everyone who bought the model.

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