Science Teaching Series

Internet Resources

I. Developing Scientific Literacy

II. Developing Scientific Reasoning

III. Developing Scientific Understanding

IV. Developing Scientific Problem Solving

V. Developing Scientific Research Skills

VI. Resources for Teaching Science

Genetics Phenotype Survey

Download Genetics Spreadsheet File | Mitosis

Identify chromosomes (karyotyping)

Characteristic: d=dominant / r=recessive Personal Phenotype and Genotype Number w/trait % of Class with Trait
  • widow's peak (d)
  • continuous hairline (r)

  • unattached (d)
  • attached (r)

Hair on middle segment of finger (dorsal side)
  • present (d)
  • absent (r)

Interlocking fingers
  • left thumb over right (d)
  • right thumb over left (r)

Hitchhiker's thumb
  • top segment of thumb straight (d)
  • top segment of thumb can be bent back (r)

Bent little finger
  • little finger bends toward ring finger (d)
  • little finger straight (r)

U-shaped tongue
  • able to roll tongue in trough-like shape (d)
  • unable to roll tongue (r)

PTC taster
  • able to taste PTC on sample paper (d)
  • unable to taste (r)

Thiourea taster
  • able to taste thiourea on paper (d)
  • unable to taste (r)

Sodium benzoate taster
  • able to taste (d)
  • unable to taste (r)

  • red-green vision (d)
  • red-green blindness (r)

Attached earlobes


Unattached earlobes
tongue-roller Non -tongue roller
hitch-hiker's thumb straight thumb


VISUAL ACUITY: A person who has sufficient visual acuity should see the number twelve in the circle on the left whether or not they have normal color vision. I   COLOR BLINDNESS: A person with normal color vision sees a number seven in the circle on the left. Those who are color blind usually do not see any number at all.
RED-GREEN COLORBLINDNESS: People with red-green color blindness see either a three or nothing at all. Those with normal color vision see an 8.   PROTANOPIA & DEUTERANOPIA
Those with normal vision see the number thirty-five in the circle above. A person with protanopia sees only he number five. A person with deuteranopia sees the number three. People who are partially color blind will see both numbers but one more distinctly than the other.