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Pedigrees

  • A pedigree is a graphic representation of genetic inheritance. It’s a way to apply genetics to family trees.
    • What do they show:
      • Males and Females
      • Family Relationships
      • Individuals that have or are affected by a trait being studied.
      • The way the trait is inherited (inheritance patterns).
    • A carrier for the trait MAY SOMETIMES BE represented by a half shaded in circle or square.
    • Deaths are marked by a horizontal line striking through the individual’s shape.

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Section 12.1 Summary – pages 309 - 314

Female

Male

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I

II

III

IV

1

2

1

1

1

3

2

2

2

4

3

3

5

4

4

5

Pedigrees

Ex. This is individual III-1 and is an unaffected female (normal)

How many generations are there?��How many kids are in the second generation?

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4

4

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Pedigrees �Additional Symbology

Consanguineous Marriages- Marriages between related individuals.

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Multiple Marriages- Sometimes individuals marry multiple times.

Adopted Children- Children can be adopted into and out of families.

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Pedigrees �Additional Symbology

Consanguineous Marriages- Marriages between related individuals.

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Multiple Marriages- Sometimes individuals marry multiple times.

Adopted Children- Children can be adopted into and out of families.

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