Patterns of Inheritance 12.4

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Patterns of Inheritance 12.4

• Sex-linked genes genes that are located on the
  sex chromosomes (X or Y)mostly found on the X
  chromosome ex. Colorblindness
• Polygenic inheritance when more than 1 gene
  controls a character ex. eye color, height, skin
  color.
• Multiple alleles when genes have 3 or more
  possible alleles ex. blood type (3 alleles with
  4 different blood types).

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Continued

• Incomplete dominance occurs when neither allele
  is completely dominant over the other neither
  allele is fully expressed ex. red snap dragon X
  white snap dragon ?
• Codominance when both alleles for the same gene
  are fully expressed ex. AB blood type

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LOTS OF EXAMPLES!!!

• Pedigree
• Colorblindness (as an example of both a sex
  linked gene and for figuring out a pedigree)
• Blood types (examples of codominance, multiple
  alleles, and for figuring out a pedigree)
• carriers