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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 : ______________________________