Question

Blood groups in humans are characterized by the presence of antigens (specifically, glycoproteins) on the surface of red blood cells. The ABO blood group is controlled by three alleles of a single gene on chromosome 9: and B are codominant, and both are dominant to į, The MN blood group is controlled by gene L on chromosome 4. The gene has two codominant alleles, LM and L^N. Rh is the most complex of the blood group types, involving at least 45 different antigens. The most clinically important antigen, D or Rho, is encoded by the gene RhD. which is found on chromosome 1. Individuals that are Rh-positive have either one or two RhD. genes, whereas the Rh-negative phenotype is caused by the absence of the RhR gene. (The antithetical allele d does not exist, however the letter "d" is used to indicate the D-negative phenotype).

Four babies born on the same day were accidentally mixed up in a maternity ward. Given the following blood types, can you match each baby to its correct set of parents.

BLOOD TYPES
BABY COUPLE
a. O, MN, Rh* 1. O, MN, Rh x B, N, Rh¯
b. AB, MN, Rh* 2. A, M, Rh* x B, M, Rh*
c. O, M, Rh- 3. A, M, Rh* x A, N, Rh
d. B, N, Rh 4. A MN, Rh x AB, M, Rh*

Answer 1

Step-by-step explanation:

a.) O, MN, Rh+: 3. A, M, Rh+ X A, N, Rh-

A = AO

Rh+ = +/-

b.) AB, MN, Rh+: 4. A, MN, Rh- X AB, M, Rh+

c.) O, M, Rh-: 2. A, M, Rh+ X B, M, Rh+

A = AO

B = BO

Rh+ = +/-

d.) B, N, Rh-: 1. O, MN, Rh- X B, N, Rh-

O = OO

B = BO

MN = MN

N = NN

Rh- = -/-