Download Critical Thinking Diagram Worksheet 9-1

Name
Class
_
_
Date
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Critical Thinking Diagram Worksheet 9-1
Xh
XhXh
Xh
.....•
~
Female
hemop hiliac has
both recessive
genes.
XhV
V
-
X
XhXh
Xhy
XhX
••••••
Xy
......•.
•....
......••.
••••••
Male hemophiliac.
Has gene for
hemophilia.
•
XhX
Female carrier
of hemophilia
trait.
XV
Normal male.
Does not have
gene for hemophilia.
Figure 1
PART A
Answer the questions following.
1. Explain why one of the female children in the Punnett square will be a carrier for hemophilia,
the other will have hemophilia.
2. Why is it necessary for a male child to inherit only one gene for hemophilia
PART B
but
to develop the disease?
•
Complete the following for Figure 2.
b.
a.
.z----,
xv
Figure 2
1. What does the chromosome
symbol Xh indicate?
_
2. Draw a square around each male genotype and a circle around each female genotype on the diagram.
3. Shade in half of each square or circle that indicates an individual who is a carrier of the hemophilia trait.
4. Shade in all of each square or circle that indicates an individual who has hemophilia.
5. Which males, if any, have hemophilia?
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6. Which females, if any, have hemophilia?
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7. Which females, if any, are carriers for hemophilia?
8. Is hemophilia
a sex-limited or a sex-influenced
_
trait? Explain.
_
".
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Critical Thinking Diagram
Worksheet 9- 7
© Addison-Wesley
-./
Publishing Company, Inc. All Rights Reserved.
•
Critical Thinking Diagram 9- 1
•
x
xv
v
•
XhXh
XhX
Female carrier
of hemophilia
trait.
Female hemophiliac
has both recessive
genes.
xv
Male hemophiliac.
Has gene for
hemophilia.
© Addison-Wesley
Publishing Company,
Inc. All Rights Reserved.
Normal male.
Does not have
gene for hemophilia.
Critical Thinking Diagram
9-1
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