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Introduction to Genetics
Contributed by: Sweek
(Original author: Lawrence)
A gene is:
One allele from one parent
Two alleles, one from each parent
Characteristic of an organism expressedby genes
A dominant gene is:
The stronger gene; represented by a
capital letter
The weaker gene; represented by a small
case letter
The weaker gene; represented by a
capital letter
The stronger gene; represented by a 
small case letter
A recessive gene is:
The stronger gene; represented by a capital
letter
The weaker gene; represented by a small
case letter
The stronger gene; represented by a small 
case letter
The weaker gene; respresented by a capital
letter
A trait is:
One allele from one parent
Two alleles; one from each parent
Characteristic of an organism expressedby genes
A genotype is:
(TT = Tall)
Expression; the actual word Tall
Combination of alleles that determine a particular trait; the letters TT
A phenotype is:
(TT=Tall)
Combination of alleles that determine
a particular trait; the letters TT
Expression; the actual word Tall
Height of Plants
What is the 
percentage of 
short plants?
25%
50%
75%
100%
T
t
TT
Tt
T
Tt
tt
t
Heterozygous means that there are two
 ____________  alleles for a trait.
same
different
Color of PlantsDominant is green (G)Recessive is yellow (g)
What are the missing 
genes?
GG
Gg
gg
G
g
GG
G
Gg
GG
G
?
evolution
differentation
immunity
heredity
The transfer of genes from
parent to offspring is called
Color of Puppies
Black is Dominant (B)White is Recessive (b)
What is the precentage of 
white puppies?
25%
50%
75%
100%
b
b
B
b
Homozygous means that there are two 
 of the _________ alleles of a trait.
same
different
Brown is dominant (B)Green is recessive (b)
What is the percentage of 
green eyes?
Color of Eyes
25%
50%
75%
100%
B
b
B
b
A Punnett Square is a tool that can   ____________
 the genotypes of offspring from parent genotypes.
determine
predict
pick
What is the percentage of an
animal having webbed feet?
Type of FeetWebbed is dominant (W)Talons are recessive (w)
25%
50%
100%
75%
W
w
W
W
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