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Genetics: Multiple Allele Traits
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Blood Type
Blood type is controlled by 3 alleles: A, B, O. A & B are codominant, O is recessive.
1. a) What are tne two genotypes possible for a person whq a1A blood?
b) What genotype does a person with AB blood have?
c )What genotype does a person with O blood
CIA
d) What are the two genotypes possible for a person who as B blood?
have?
4. A woman with type A blood (genotype AO) is married to a type B person (genotype BO). What proportion of tng;r
children will have:
Xffi;;3tfiBbrood?*]-f[oorooa&$?*ABbrood
]5*?.
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0lH
m
m-an with type AB blood is the father of her child who is type B.
5. A woman with type A blood is claiming tha
Could this man be the father of the child?
can have AA or AO genotypes
Assuming that he is the father, what must the mother's
6. A man with type AB blood is married to a woman with type O blood. They have two natural children and one
adopted child. Jane has type A blo*od, Folby has type B bl"ood, and Grace has type O blood.
Which child was adopted?
G&A(e-
O
SMILEYS
GENETICS
O
ln smileys, the shape of the eye is controlled by multiple alleles, much like blood types. The smileys pictured show the
four possible phenotypes. lt is known that the Cta!'-_and-dglglleS are codominant and the square eyes is a recessive
trait. Assign genotypes to each of the smileys pictured. (Hint. Use blood type genotypes to help you)
7. Show Genotypes
Sarry
SS
Sa
Stard".
Square
Dol
@"@3Ig
f,A
8. lf a star-eyed smiley (homozygous) is crossed with a dot-eyed smiley (also homozygous) what will all of thei
orrspring took
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tike?
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flilim
Sr"El:TSil
wh
at
pe rce ntas
e or
th
S
e orrs pri n g wi I be :
I
P
SS
Dm'l-sel
a D[:D.M
ffi
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'O?r
smil^ey is crosseQ
crosseg[with
with a squaggeyed
squap eyed smiley what percentage of the ofsplin
10. lf a starry-dot
star-ry-dot eyed smiley
starry 5O?*
star-dot OY^ oot S0tsquare
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