Download Pedigree Charts A pedigree chart is a diagram that shows

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Name____________________________
Class __________________
Date __________
Pedigree Charts
A pedigree chart is a diagram that shows family relationships.
This pedigree chart shows how the trait of a white lock of hair has
been inherited in a family. The allele that codes for a white lock of
hair is dominant.
Study the chart. Then, answer the questions below.
A White Lock of Hair
A circle represents
a female.
A square represents
a male.
A vertical line
and a bracket
connect the
parents to their
children.
A horizontal line connecting
a male and female represents
a marriage.
Ww
ww
A circle or square that is
not shaded indicates
that a person does not
express the trait.
A shaded circle or square
indicates that a person
expresses the trait.
1. How many males shown in the chart have a white lock of hair?
three
2. The alleles of two of the people in the chart are provided. What
are the alleles of their three children?
ww
Son without white lock:
Son with white lock:
Ww
Daughter with white lock:
Ww
© Pearson Education, Inc., publishing as Pearson Prentice Hall.
129
Name____________________________
Class __________________
Date __________
Human Blood Types
The ABO blood group gene codes for different antigens on the
surface of a person’s red blood cells. There are three alleles for this
gene, IA, I B, and i. Depending on a person’s alleles, they can have
A antigens, B antigens, both, or none.
Label which blood types have A only, B only, A and B, or no antigens
on their red blood cells. The first one has been done for you.
Blood Groups
Phenotype
(Blood Type)
of Patient
Genotype
of Patient
Antigen on
Red Blood Cell
A
I AI A or I Ai
A only
B
I BI B or I Bi
B only
AB
I AI B
A and B
O
ii
no antigens
Using the blood sample descriptions, identify one possible genotype of the
patient who donated the blood sample. The first one has been done for you.
Blood Sample
Possible Patient Genotype
Red blood cells have A antigens.
I Ai, I AI A, or I AI B
Type AB
I AI B
Red blood cells have no antigens.
ii
Type B
I Bi or I BI B
Use the tables to answer the questions.
1. Which alleles are codominant?
I A and I B
2. Which allele is recessive?
i
© Pearson Education, Inc., publishing as Pearson Prentice Hall.
130
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