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Transcript
Co dominant,
Sex Linked and
Polygenic Traits
Donor Blood Type
Type A
Type B
Type AB
Type O
Type A
Y
N
N
Y
Type B
N
Y
N
Y
Type AB
Y
Y
Y
Y
Type O
N
N
N
Y
Recipient
 Colorblindness
• X chromosome,
• recessive

Duchenne muscular dystrophy
• gene for dystrophin, important structural protein
in muscle

Hemophilia
• Inability of blood to clot
 Most “phenotypic
traits” are the result of
multiple gene interactions.
 In humans these include
• Hair color
• Skin pigmentation
• Eye color
• Height
• Weight
•
At least 4
genes
control hair
color
f two AaBbCc people would get married and have children, the Punnett square would look like this:
If two heterozygous individuals (AaBbCc) have a child, what is the
probably that their child will be very dark skinned?
• More than 6 genes control eye color
•Two genes on Chromosome 15 account
for most of the eye color combinations