Finding Your Genetic Match
Have you ever noticed that brothers or sisters often look alike? Their inherited traits are what make their physical appearance so similar. An inherited trait is a particular genetically determined characteristic that distinguishes a person. The traits of children are determined by the traits that are passed on from their parents. Some traits are obvious in a family --- a child's nose is shaped like their mother's nose, but some traits are less obvious. You may have similar traits to many of your classmates even though you are not related to them. Some examples of often un-noticed human traits are the ability or not to roll your tongue, attached or unattached earlobes, dimples or freckles, naturally curly or straight hair, hitchhiker's or straight thumb, straight or widow's peak hairline, smooth or cleft chin, or colorblindness or normal vision.
There are numerous traits in humans, but some traits occur more frequently than others. Between 70-90% of the human population have free-hanging earlobes, can roll their tongue, are right-handed, and can taste a chemical called PTC. These traits are called high frequency traits.
Students will determine the presence of certain high frequency traits in themselves & their classmates.
Genetic Inventory sheet with pictures, paper, pencil, PTC taste strips.
Identify which of the following 10 human traits you have by placing a check mark beside that trait.
Compare the traits you have with other students in the classroom and find the student you most closely match.
Human Trait Inventory
|Left Thumb on top when Hands Crossed|
|Right Thumb on top when Hands Crossed|
|Hair on mid-digit of hand|
|No hair on mid-digit of hand|
|Bent little finger|
|Straight little finger|
|Second toe longer than big toe|
|Second toe not longer than big toe|
|Can Taste PTC|
|Can Not Taste PTC|
|Vulcan (Fingers spread 2 by 2)|
|Tongue Roller||Non Roller||Dimples||No Dimples|
|Attached Earlobes||Unattached Earlobes||Widow's Peak||Straight Hairline|
|Longer Second Toe||Short Second Toe||Bent Little finger||Hitchhiker's Thumb|
Attached Ear lobes (left)
|"VULCAN" or No "VULCAN"||Dimples||Right/Left Thumb on top|