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Intro to Genetics
Prispevano od: 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
Color of PlantsDominant is green (G)Recessive is yellow (y)
What are the missing 
genes?
GG
Gy
yy
G
y
GG
G
Gy
GG
G
?
Length of Worms
Long is Dominant (L)
Short is Recessive (s)
What is the missing allele?
S-capital 
s-lower case
L-capital
l-lower case
s
s
Ls
Ls
?
ss
ss
s
Color of Puppies
Black is Dominant (B)
White is Recessive (w)
What is the precentage of 
white puppies?
25%
50%
75%
100%
w
w
B
w
Brown is dominant (B)
Green is recessive (g)
What is the percentage of 
green eyes?
Color of Eyes
25%
50%
75%
100%
B
g
B
g
What is the percentage of an
animal having webbed feet?
Type of Feet
Webbed is dominant (W)
Talons are recessive (t)
25%
50%
100%
75%
W
t
W
W
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