Download Background Objectives Materials Preparation 1`- Procedure

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Name
Date
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Class
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QUICK LAB
Interpreting Information in a Pedigree
Background
Organizing information is often the key to solving a problem. Tracing the
hereditary characteristics over many generations can be especially confus
ing unless the information is well organized. In this activity, you will learn
how to organize hereditary information, making it much easier to analyze.
Objectives
In this activity you will
construct and analyze a pedigree.
Materials
• paper
• pencil
Preparation
1. Pedigree I traces the dimples trait through three generations of a famil
Blackened symbols represent people with dimples. Circles represent
females and squares represent males.
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II
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1’Pedigree I
Procedure
2. The following passage describes the family shown in Pedigree L
Although Jane and Joe Smith have dimples, their daughter, Clarrisa,
does not. Joe’s dad has dimples, but his mother, and his sister, Grace,
do not. Jane’s dad, Mr. Renaldo, her brother, Jorge, and her sister,
Emily, do not have dimples, but her mother does.
3. Write the name of each person below the correct symbol in Pedigree I.
How are marriage and offspring symbolized? What do the Roman
numerals symbolize?
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4. Make a pedigree based on the following passage about freckles.
Andy, Penny, and Delbert have freckles, but their mother, Mrs.
Cummins, does not. Mrs. Giordano, Mrs. Cummins’s sister, has freckles,
but her parents, Mr. & Mrs. Lutz, do not. Deidra and Darlene Giordano
are freckled, but their sister, Dixie, like her father, is not freckled.
1. Evaluating Techniques What advantages does a pedigree have over a
written passage?
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2. Sununarizing Observations How does a pedigree organize hereditary
information, making it easier to understand?
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HOLT BIOSOURCES Lab Program: Quick Lab AS
Class
dgree Chart
Date
&ee or attached earlobes
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in the spaces below each person’s nam
e, write a possible genotype for
the individual. You might
Punnett square to check your work.
need to use a
A square symbolizes a male.
A circle symbolizes a female
.
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Grandparents
Grandpa
Grandma
Cramps
Granny
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Parent
Generation
Aunt Betty
Uncle Jim
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Mom
Dad
Uncle Bob
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Uncle Mike
Children
Sister Sue
Brother John
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Little Joe
Sister Mary
Sister Jane
Sister Abby
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Free earlobes
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Attached earlobes
F Dominant gene (Free earl
obes)
f= Recessive gene (Attach
ed earlobe
s)
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Name
Pedigree Worksheet
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1.
‘v’vhich members
or the ramily aoove
afflicted with Huntmgtons
are
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Disease?
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2. There are no carriers for Huntington’s Disease- you either have it or you don’t.
WithTJn mmd, is Huntmgtons diase caused by a dominant or recessive trait?
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3. How many children did individuals I-i and 1-2 have?
How many have Huntington’s Disease?
4. How many girls did IT-i and 11-2 have?
5. How
is
individual 111-2 and 11-4
related?
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5. The pedigree to the right shows the passing on
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1-2 and 111-5?
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3. How are individuals 111-1
and 111-2 related? cOU
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of Hitchhiker’s Thumb in a family. Is this trait
dominant or recessive? rpcLcci’f ‘
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9. Name 2 individuals that
have hitchhiker’s thumb.
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10. Name 2 individuals that were
carriers of hitchhiker’s thumb.
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11. Is it possible for individual IV-2 to be a carrier?
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