Human Traits Human Traits LabLab
Human Traits LabHuman Traits Lab
Objectives: Objectives: 1) To observe some inherited traits.1) To observe some inherited traits.2) To see whether dominant traits are 2) To see whether dominant traits are more common than recessive traitsmore common than recessive traits
Procedures:Procedures:Check yourself and all other members Check yourself and all other members of your class for the following traits. of your class for the following traits. Record the data on the chart provided.Record the data on the chart provided.
Tongue RollingTongue Rolling
The tongue can be The tongue can be rolled to form a rolled to form a “U”“U”
Bent PinkyBent Pinky
The last joint of The last joint of the pinky is bent the pinky is bent toward the other toward the other fingersfingers
Widow’s PeakWidow’s Peak
When the hair is When the hair is pulled back, a pulled back, a distinct point of distinct point of hair can be seen in hair can be seen in the center of the the center of the foreheadforehead
Attached EarlobesAttached Earlobes
The earlobes are The earlobes are attached to the attached to the side of the head, side of the head, all the way to the all the way to the bottom of the lobe.bottom of the lobe.
Hitchhiker’s ThumbHitchhiker’s Thumb
The last joint of The last joint of the thumb bends the thumb bends back at a right back at a right angle to the rest of angle to the rest of the thumbthe thumb
Short Big ToeShort Big Toe
The big toe is The big toe is shorter than the shorter than the second toesecond toe
Short Index FingerShort Index Finger
When held perpendicular to a When held perpendicular to a straight line, the index finger is straight line, the index finger is shorter than the ring fingershorter than the ring finger
Mid Digital HairMid Digital Hair
The middle section The middle section of each finger has of each finger has hair on ithair on it
Pigmented IrisPigmented Iris
The iris of the eye The iris of the eye is brown, black, is brown, black, hazel or greenhazel or green
Blue or gray irises Blue or gray irises are unpigmentedare unpigmented
PTC TasterPTC Taster
1.1. Place one end of the “control” paper Place one end of the “control” paper on the tip of your tongue.on the tip of your tongue.
2.2. Place one end of the “PTC” paper on Place one end of the “PTC” paper on the tip of your tongue.the tip of your tongue.
If you notice a difference in the taste If you notice a difference in the taste of paper, a distinctly bitter taste, of paper, a distinctly bitter taste, then you can taste the chemical then you can taste the chemical phenylthiocarbonatephenylthiocarbonate
Folded HandsFolded Hands
When hands are When hands are folded in your lap, folded in your lap, the LEFT thumb the LEFT thumb falls naturally on falls naturally on toptop
Color BlindnessColor Blindness
Use the picture to Use the picture to test for test for colorblindnesscolorblindness
DimplesDimples
Smile at a Smile at a neighbor to neighbor to determine if you determine if you have dimples or have dimples or notnot
Class DataClass Data
It is now time to share your data with the class. It is now time to share your data with the class. The teacher will take a poll to see how many The teacher will take a poll to see how many
students have each trait. Please listen carefully students have each trait. Please listen carefully and raise your hand when appropriate.and raise your hand when appropriate.
For each trait, record the total number of For each trait, record the total number of students in the class that have the trait in the students in the class that have the trait in the data table.data table.
Calculate the percent of students in your class Calculate the percent of students in your class that have the trait by dividing the number of that have the trait by dividing the number of students that have the trait by the total number students that have the trait by the total number of students in the class.of students in the class.
AnalysisAnalysis
1) Use your data to 1) Use your data to answer #1.answer #1.
2) Use the chart to 2) Use the chart to answer #2answer #2
3) Complete the rest 3) Complete the rest of the analysis of the analysis questionsquestions
DominantDominant RecessiveRecessive
Tongue rollTongue roll No rollNo roll
Bent pinkyBent pinky Straight pinkyStraight pinky
Widow’s peakWidow’s peak Straight Straight hairlinehairline
Free earlobeFree earlobe Attached Attached earlobeearlobe
Normal Normal thumbthumb
Hitchhiker Hitchhiker thumbthumb
Short big toeShort big toe Long big toeLong big toe
Short index Short index fingerfinger
Long index Long index fingerfinger
No middigital No middigital hairhair
Middigital Middigital hairhair
Pigmented Pigmented IrisIris
Unpigmented Unpigmented irisiris
Bitter TasteBitter Taste No TasteNo Taste
Left thumb on Left thumb on toptop
Right thumb on Right thumb on toptop
Normal Normal colorvisioncolorvision
ColorblindColorblind
DimplesDimples No dimplesNo dimples