Question

1. The MN blood group system is under the control of an autosomal locus found on...

1. The MN blood group system is under the control of an autosomal locus found on chromosome 4, with two alleles designated LM and LN. The blood type is due to a glycoprotein present on the surface of red blood cells, which behaves as a native antigen. LM and LN are codominant and heterozygotes express both antigens and have blood type MN.

In the following crosses, what will be the genotypes and phenotypes, and their ratios, in the offspring?

a. LMLM   X   LMLN

b. LNLN   X   LNLN

c. LMLN   X   LMLN

d. LMLN   X    LNLN

e. LMLM    X    LNLN

Homework Answers

Answer #1

We can draw a punnett square to find out the possible genotypes and phenotypes. Please see the image attached. M type blood will be present only when both alleles are M. Similarly, N type blood will be there when both alleles are N. When alleles M and N both are present, MN blood type will be formed since both these alleles are codominant.

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