"Pedigree Worksheet - Ap Biology, Mr. Croft, Somerset Berkley Regional High School"

ADVERTISEMENT
ADVERTISEMENT

Download "Pedigree Worksheet - Ap Biology, Mr. Croft, Somerset Berkley Regional High School"

Download PDF

Fill PDF online

Rate (4.8 / 5) 29 votes
Names: _________________________
Class: __________
Date: __________
Biology
Mr. Croft
Pedigree Activity
30 Points
A pedigree chart is used to study the passing of a trait through a number of generations.
People who raise show animals, such as dogs and cats, often use these charts for their
animals so the inheritance of desired traits from generation to generation can be traced.
Pedigree charts also are used to study the inheritance of certain diseases or disorders in
humans, such as sickle-cell anemia.
Procedure:
A. Study the key shown for symbols used on a pedigree chart.
B. Use the pedigree chart shown for sickle-cell anemia (autosomal recessive disease) to
answer the following questions (3 Points Each).
Names: _________________________
Class: __________
Date: __________
Biology
Mr. Croft
Pedigree Activity
30 Points
A pedigree chart is used to study the passing of a trait through a number of generations.
People who raise show animals, such as dogs and cats, often use these charts for their
animals so the inheritance of desired traits from generation to generation can be traced.
Pedigree charts also are used to study the inheritance of certain diseases or disorders in
humans, such as sickle-cell anemia.
Procedure:
A. Study the key shown for symbols used on a pedigree chart.
B. Use the pedigree chart shown for sickle-cell anemia (autosomal recessive disease) to
answer the following questions (3 Points Each).
1. How many generations are represented in the chart for sickle-cell anemia? ______
2. How many carriers of the sickle-cell trait are in each generation?
3. How many people in the family were born with sickle-cell anemia? ______
4. From which parent did the second-generation children inherit the sickle-cell gene?
5. In which generation did sickle-cell anemia first show?
6. What can you determine about a family using a pedigree chart?
7. In some pedigree charts, you cannot determine the two genes, or genotype, of
each individual. What symbol would not be used in this kind of pedigree?
C. Study the data table shown for deafness (autosomal recessive disease) in a family.
On a separate piece of paper, develop a deafness pedigree chart for the family. Be
sure to use proper symbols.
Generation I
Generation II
Generation III
Spouse’s
Grandchildren’s
Genotype
Gender Genotype Gender
Genotypes
Genotypes/Gender
Dd
M
DD
M
Dd
DD/M & Dd/F
Dd
F
Dd
F
DD
Dd/F
dd
M
Dd
dd/F & Dd/M
D = normal hearing, d = deafness
Once you are done, use these guidelines to continue the chart to the next generation:
1. All of the Generation III people marry people who carry the gene for deafness.
2. Each couple in Generation III has 2 children.
3. Four children in Generation IV are deaf.
The completed pedigree is worth 9 Points.
Page of 2