A pedigree for Landsteiner blood types is indicated below. The phenotypes (blood

Q: A pedigree for Landsteiner blood types is indicated below. The phenotypes (blood

Blood type & Genotype Phenotype (blood type) Genotype Type A IAIA or IAi Type B IBIB or IBi Type AB IAIB Type O ii Type A and Type B cross Mother (type A) Father (Type B) IAIA IBi IAIA IBIB IAi IBIB IAi IBi Phenotype (blood type) Genotype Type A IAIA or IAi Type B IBIB or IBi Type AB IAIB Type O ii

ID: 300579 • Letter: A

Question

A pedigree for Landsteiner blood types is indicated below. The phenotypes (blood types) of some individuals are listed (A for type A blood, B for type B blood, O for type O blood, etc). Determine ALL possible genotypes of ALL eleven individuals, whether their phenotype is provided or not (A = protein A present, B = protein B is present, i=neither protein is present). Several genotypes may be possible for some individuals (8 pts).

Hint: For example, the individual indicated by the arrow has blood type B. This means the individual's genotype could possibly be either BB or Bi. However, since one of this individual's offspring has blood type O (ii), the individual (indicated by the arrow) must have the genotype Bi (not BB). So you would write Bi next to the individual indicated by the arrow. Now figure out the possible genotype(s) for all the other 10 individuals in this pedigree.

Explanation / Answer

Blood type & Genotype

Phenotype (blood type)

Genotype

Type A

IAIA or IAi

Type B

IBIB or IBi

Type AB

IAIB

Type O

Type A and Type B cross

Mother (type A)

Father (Type B)

IAIA

IBi