Hereditary Traits

A quick review of terms

Dominant

a trait that will appear in the offspring if one of the parents contributes it

Recessive

a trait that must be contributed by both parents in order to appear in the offspring.

A quick review contd.

Genotype This is the "internally coded, inheritable information"

carried by all living organisms. This stored information is used as a "blueprint" or set of instructions for building and maintaining a living organism.

Phentotype All the observable characteristics of an organism, such

as shape, size, colour, and behaviour, that result from the interaction of its genotype with the environemnt.

The phenotype may change throughout the life of an individual because of environmental changes and the changes associated with aging.

Ear lobes

Free (dominant)

Attached

White Forelock

A white forelock is a patch of white hair, usually located at the hairline.

With (dominant)

Without

Dimples

With (dominant)

Without

Thumbs

Straight (dominant)

Curved

Pinky finger

Straight

Bent (dominant)

Mid-digit hair

With (dominant)

Without

Red-Green Colour blind

Everyone should be able to read the number 12

Those with normal color vision should read the number 8. Those with red-green color vision deficiencies should read the number 3. Total color blindness should not be able to read any numeral.

Normal vision should read the number 29. Red-green deficiencies should read the

number 70. Total color blindness should not read any

numeral

Normal color vision should read the number 5.

Red-Green color deficiencies should read the number 2.

Normal color vision should read the number 45.

The majority of those with color vision deficiencies cannot read this number or will read it incorrectly.

Tongue

Roll (dominant)

Unable to roll

Now lets survey the class How many: Earlobes – attached, unattached White forelock – with, without Widows peak Dimples Thumbs – curved, straight Pinky finger – straight, bent Mid-digit hair – with, without Red-green colour blind – yes, no Tongue rollers – yes, no