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Anthr 105
Biological Anthropology Lab
Dr. Bolter
Exercise
Blood Problems
Blood type is a 3 allele system—A, B and O. Both A and B are codominant and produce anitgens A and B. The O allele produces no antigens,
and is therefore recessive.
The Rh factor is a simple two allele system, inherited as either +
(positive-dominant) or – (negative-recessive).
M, N and MN is another locus affecting the blood. MN blood types are
determined by two codominant alleles. The genotype MM produces the M
phenotype. Genotype NN produces the N phenotype. Genotype MN
produces the MN phenotype.)
Problems: Show your work.
1. Given the following matings and the blood types of the parents, what
would the blood types of the offspring be? Give all possibilities and their
probabilities.
a. O x O
d. O x AB
b. O x A (homozygous)
e. A x B (both heterozygous)
c. O x A (heterozygous)
f.
AB
x
AB
2. In a recent court case, a man of blood type A was accused of fathering a
child of blood type B. The mother was blood type AB. Could this man have
been the father?
Blood groups Page 1 of 2
Modified from Phil Stein, lab manual for Physical Anthropology
by Stein, P. and Rowe, B.
Anthr 105
Biological Anthropology Lab
Dr. Bolter
3. A man who is type MN mates with a woman who is type N. Give the
possible blood types of their offspring and the probabilities for each.
4. A woman is blood type A, Rh-positive (heterozygous for both), and her
mate is O, Rh-positive (heterozygous). Give the possible blood types of
their offspring and the probabilities for each.
5. For the following mating give the possible blood types of the offspring
and the probabilities for each: O, Rh-positive (heterozygous), M, and her
mate is AB, Rh-negative, MN.
Blood groups Page 2 of 2
Modified from Phil Stein, lab manual for Physical Anthropology
by Stein, P. and Rowe, B.