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Name: ________________________________
Date: ____________ Period _____ # _____
Inheritance Patterns
1. Single Genes w/ Two Alleles
 Trait controlled by a single gene with one__________________________ and one
____________________ allele
 These traits have __________________________________________________________.
 Examples:
A. ________________________________________________
B. ________________________________________________
2. Incomplete Dominance
 This is when the dominant allele does not
_________________________________ the recessive allele.
 ___________________________ individuals show a phenotype that is a
______________________ of the dominant and recessive phenotypes.
3. Codominance
 The two alleles are ________________________ dominant nor recessive, so
both are _____________________ in the phenotype.
4. Single Genes w/ Multiple Alleles
 Traits controlled by a __________________________ that
has three or more possible ______________________
 Example: Human Blood Type
A. The A and B alleles are
____________________________.
B. The O allele is _____________________ to
both A and B.
Codominance
Alleles for Blood Type
Blood Type
Combination of
Alleles
A
B
AB
O
5. Traits Controlled by Many Genes
 Some traits are controlled by __________________________________ acting together as a group to produce a single trait.
 Examples: ___________________________________, _______________________________, _______________________________
6. Sex Chromosomes
 The __________________ pair of chromosomes are known as the sex
chromosomes.
 They carry genes that determine whether a person is
_________________________________
A. Male = ________
B. Female = _________
 They also carry genes that determine __________________________.
7. Sex-Linked Traits
 Genes for these traits are carried on the
____________________________, usually on the X chromosome.
 There is no matching gene for the trait on the
_____________________________. This makes it more likely for
__________________________to inherit the trait controlled by
the__________________________ allele.
 _________________________ are more likely to be
___________________________ (they have a recessive allele for the
trait, but do not show it)
 Example of Sex-Linked Trait : ______________________________