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