The Pedigree

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The Pedigree

• No silly.not the dog food!

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The Pedigree

• Sometimes the Punnett square doesnt cut it
• Pedigrees allow us to see generations
• They allow us to follow certain traits throughout
  a family history

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Symbols

• Males are represented by
• Females are represented by
• Shading marks the traits

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Lines

• Lines can tell us
• The relationship among individuals
• Who is dead
• Who are twins

Are these twins identical? How can you tell?
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Take a look See
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Some Vocab.

• Autosomal trait
• Trait that appears equally in both males and
  females (do you remember what Automsomes are???)
• Sex Linked trait
• A trait that is located on the X chromosome,
  because males only have one X ccome they if they
  have a sex linked trait they will exhibit that
  phenotype for the tait.

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Sex linked traits

• Hemophilia
• Color blindness
• Females that are heterozygous for a sex linked
  trait will be carriers. Females can only show
  the trait if they are homozygous for that trait.
• So how could a woman be color blind or have
  hemophilia????

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Showing Sex linked

• Genotypes/Phenotypes
• XX normal female
• XcX Female carrier for Colorblindness
• XcXc Colorblind Female

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Showing Sex linked

• Genotypes/Phenotypes
• XY Normal male
• XhY male with hemophilia