Humans have many genes that contribute to the unique array of proteins found on their red blood cells.Your MN blood type (the letters indicate the presence of M and N proteins on the red blood cells)is determined by the codominant alleles Lᴹ and Lᴺ.Which of the following genotypes could NOT be produced when a man with MN blood and a woman with MN blood mate?
A) LMLM
B) LMLN
C) LNLN
D) LMNLM

Question

Quizplus · Accepted Answer

When a man with MN blood and a woman with MN blood mate, they could produce offspring with the following genotypes: LMLM, LMLN, LNLN, and LMN. LMN is possible because the man has both Lᴹ and Lᴺ alleles, and each parent can randomly contribute one allele to each offspring. Therefore, the only genotype that could not be produced from this mating is D, LMNLM, as it requires two copies of the LMN genotype, which is not possible with only one parent carrying the LMN allele.

Humans Have Many Genes That Contribute to the Unique Array