What traits do we inherit
from our parents?
What does the word prevalent mean?
Predictions?
Hitchhiker’s Thumb
• Straight thumbs (dominant
trait) can be seen as nearly a
straight line and may contain a
slight arch when viewed from
the side as in the illustrations.
• Curved thumbs (recessive trait)
can be seen as part of a circle.
Ear Lobes
• Free earlobes (dominant trait)
hang below the point of
attachment to the head.
• Attached ear lobes (recessive
trait) are attached directly to
the side of the head.
Widow's Peak
• Widow’s Peak
(dominant trait)
• Straight Hairline
(recessive trait).
Roll Tongue
• Rolled Tongue (dominant
trait)
• Cannot roll tongue
(recessive trait).
Right Handed
• Right handed (dominant
trait)
• Left Handed (recessive
trait).
Mid Digital Hair
• Mid digital hair
•
(dominant trait)
Hairless (recessive trait).
Freckles
• Freckles
(dominant trait)
• No Freckles (recessive
trait).
Dimples
• Dimples
(dominant trait)
• No Dimples (recessive
trait).
Cleft Chin
• Cleft Chin
(dominant trait)
• No Cleft (recessive trait).
Clasp hands left over right
• Left over Right
(dominant trait)
• Right over left(recessive
trait).
Six Fingers
• Six Fingers
•
(dominant trait)
5 fingers (recessive trait).
Bent Pinkies
• Bent pinky (dominant trait)
• Straight pinky (recessive
trait):
1. Hold your hands together as if
you are covering your face.
2. If the tips of the pinkies (or baby
fingers) point away from one
another, the pinkies are bent
(recessive trait).
Longer Big Toe
• Longer Big toe
(dominant trait)
• Longer 2nd toe(recessive
trait).
Taste PTC
• Taste PTC
(dominant trait)
• Can’t Taste PTC (recessive
trait).
Calculating Percent
• Percent (%) = number of students with the
trait / total number of students surveyed X
100.
• For example: 15 students with the trait / 25
students surveyed X 100 = 60%
Sample Graph