Page 11 - Genetics_FULL

L

D
R

What Is an Allele? chromosome pair
chromosome pair
recessive dominant
dominant
recessive
Different forms of the same gene are
called alleles. An organism inherits
fur color gene
alleles
two alleles for each gene. alleles ab AB fur color gene
The alleles for rabbit fur color can be Cd cD
dominant or recessive. A capital letter fur color
is used to represent a dominant allele (phenotype)
and a lowercase letter is used for a Ef eF
recessive allele. gH G

h
i
I
j
J
from from Bb
from
from
mother father
father mother genotype
Alleles and Traits

When both a dominant and recessive allele are present, the dominant trait is always seen.
The dominant allele masks the presence of the recessive allele. The recessive trait is seen
when there are two copies of the recessive allele.

recessive
dominant
recessive dominant recessive
recessive

Ab
ab
ab
AB
Cd
Cd
cD
cD
Ef
eF
G
G
h
h
gH
gH
i
i
I
I
j
j
J
J
Bb bb Ef eF
recessive trait
dominant trait recessive trait
dominant trait
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