|
|
Other Normal Traits
For each trait in the following table, the dominant form (the form where one copy is sufficient) is shown in the right column.
| Hand Clasping |
Right thumb on top |
Left thumb on top ‐ at least one of your parents should clasp hands with the left thumb on top |
Hitchhiker Thumb |
Hitchhiker thumb |
Straight thumb ‐ at least one of your parents should have straight thumbs |
Tongue Rolling |
Cannot roll tongue |
Tongue roller ‐ at least one of your parents should be a tongue roller |
Ear Lobes |
Attached ear lobes |
Unattached ear lobes ‐ at least one of your parents should have unattached ear lobes |
Widow's peak |
Straight hairline |
Widow's peak ‐ at least one of your parents should have a widow's peak |
Although these traits have long been used as examples of normal variation that can be tracked through families, it is not established that each trait is determined by a single gene. In fact, exceptions have been documented. To get the scientific facts, visit OMIM - Online Mendelian Inheritance in Man to see information about each trait: hand clasping, tongue rolling, attached ear lobes, and widow's peak.
|
| |
|
