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Let’s Practice
Autosome Trait for Hemoglobin
• Alleles:
• Normal Hemoglobin (Dominant) (H)
• Sickle Cell Hemoglobin (recessive) (hs)
A woman has a sister who has sickle cell anemia.
The woman decides to have genetic testing
before she and her husband, who carries the
sickle cell allele, have a child. She wants to
know what the chances of having a baby with
sickle cell anemia would be.
♂
Key
Normal
Carrier
Disease
Sickle Cell
Hemoglobin
♀
Sickle Cell Anemia Punnett Square
Probability Problem
♂
♀
H
hs
♂
♀
H
H
H
hs
H
hs
Let’s Practice
Sex Linked Trait for Red/Green Color Blindness
• Alleles:
• Normal Red/Green Sight (Dominant) (XC)
• Red/Green Color Blindness (recessive) (Xc)
A couple request genetic testing because the
husband is color blind and the wife has normal
vision but has a grandfather who is color blind.
They are worried about passing Red/Green
Color Blindness onto their children.
♂
Key
♀
Normal
Carrier
Disease
Red/Green
Color Blindness
Red-Green Color Blindness Punnett Square
Probability Problem
♂ Xc
y
♂
♀
c
X
y
♀
XC
XC
Xc
XC