Page 5 - Chromosome_genes_DNA_FULL

L

G

gene
gene
Function of a Gene

Each gene along a strand of DNA has the A
T T A C
information to tell the cell to produce a G
specific protein. A C G T
A G
T G C C
A gene is made up of a particular sequence
of DNA bases. This sequence acts as a DNA
code for a protein.

protein
protein

What Is a Trait? earlobe shape
free
a ached a ached
free
The production of different proteins
determines the traits of an organism.
A trait is an inherited characteristic.

Genes that exist in alternate forms
are called alleles. The gene that
alleles
determines earlobe shape exists alleles
in two alleles—one results in an
attached earlobe and the other Ab AB ab aB
a free earlobe. Cd cD Cd cD

Ef
Ef
eF
eF
h
h
i
i
I
I
j
j
J
J
Human Blood Groups gH G gH G
Genotype Genotype Multiple Alleles
Blood Group A B Blood Group A B
(alleles - I ,I ,i) (alleles - I ,I ,i) Some genes have more
than two, or multiple
A I I or I i AB I I alleles. The human ABO
A A
A
A B
blood group gene has
three alleles that can
B I I or I i O ii combine into four types
B B
B
of blood groups.

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