Instructor Demonstration: Dichotomous key to music formats
1. It is a rectangle …… a cassette tape.
It is a circle …… go to 2.
2. It is larger than 13.0 cm …… go to 3.
It is smaller than 13.0 cm …… go 4.
3. It is less than 18.0 cm …… 45 rpm vinyl record.
It is greater than 18.0 cm …… 33 rpm vinyl record.
4. It is exactly 12.0 cm …… digital album.
Note: in the absence of any markings, it is nearly impossible to indicate if it is a
CD, DVD, or Blu-ray disc.
In the example above, it is possible to see how a dichotomous key can be used to distinguish different formats containing music. However, unless the digital discs have labels, it is nearly impossible to tell apart a CD, DVD, and Blu-ray disc. This is because they are cryptic. Can you tell apart these three disc types by looking only at their reflective bottoms? There are no labels on organisms, which means cryptic species are usually separated by sequencing DNA. With these three types of digital albums, the data formats of each disc are different, similarly to how the DNA code is different between cryptic species.
How would you go about telling the difference in data structure and format
between the three disc types? _________________________________________
__________________________________________________________________
III. MATERIALS
• Activity 1
o Assorted nails and screws
o Ruler
o Dichotomous key to the nails and screws provided below
• Activity 2
o Various plastic toy dinosaurs
Instructor Demonstration: Dichotomous key to music formats1. It is a rectangle …… a cassette tape. It is a circle …… go to 2.2. It is larger than 13.0 cm …… go to 3. It is smaller than 13.0 cm …… go 4.3. It is less than 18.0 cm …… 45 rpm vinyl record. It is greater than 18.0 cm …… 33 rpm vinyl record.4. It is exactly 12.0 cm …… digital album. Note: in the absence of any markings, it is nearly impossible to indicate if it is a CD, DVD, or Blu-ray disc.In the example above, it is possible to see how a dichotomous key can be used to distinguish different formats containing music. However, unless the digital discs have labels, it is nearly impossible to tell apart a CD, DVD, and Blu-ray disc. This is because they are cryptic. Can you tell apart these three disc types by looking only at their reflective bottoms? There are no labels on organisms, which means cryptic species are usually separated by sequencing DNA. With these three types of digital albums, the data formats of each disc are different, similarly to how the DNA code is different between cryptic species. How would you go about telling the difference in data structure and format between the three disc types? ___________________________________________________________________________________________________________III. MATERIALS• Activity 1o Assorted nails and screwso Rulero Dichotomous key to the nails and screws provided below• Activity 2o Various plastic toy dinosaurs
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