n humans, the ABO blood groups are determined by threealleles present at an auto

ID: 33486 • Letter: N

Question

n humans, the ABO blood groups are determined by threealleles present at an autosomal locus, while the MN blood groupsare determined by just two codomiant alleles at an unlinkedlocus. A. For each family listed below, decide which among the listedblood types are expected to be possible for the children of such parents, and whichare not. At the right, write the ones that are NOT expected

. Parents Children ? Not expected

__________ _______________ ___________

ABMN x ABMN AMN, OMN, ABM,OM

AM x AN AM, AMN, AN, OMN

ON x BN AN, BN, ABN, ON

ABN x ON AN, AM, BN, ON, ABN

__________ _______________ ____________

.Predict the possible blood types for daughters of a IBiMN fatherand an IAiNN mother. What are the relative probabilities of each?

Explanation / Answer

Parents

Children

Not expected

ABMN x ABMN

AMN, OMN, ABM,OM

OMN,ABM,OM

AM x AN

AM, AMN, AN,OMN

AM,AN,OMN

ON x BN

AN, BN, ABN,ON

AN,ABN

ABN x ON

AN, AM, BN, ON,ABN

AM,ON,ABN

The possible blood types for IBiMN father and an IAiNN mother are

IBIA,

IBiNN,

IBiNN (B blood group)-25%

IAIB (AB blood group)-50%

iMNiNN (O blood group)-25%

Hence, AB, O, and B are the possible blood types for daughters.