PLEASE HELP ME I NEED THIS QUICK!! In humans, three alleles affect blood type. The A and B alleles are co dominant and the O allele is recessive. Which of the following answer choices is true?
(Choose 2 answers)
a. The O blood type is least common in the human population.
b. The A and B alleles are co dominant because both alleles are simultaneously expressed in the heterozygote.
c. Human blood type is an example of multiple allele inheritance.
d. Human blood type is an example of incomplete dominance.

Solve the problem by using a venn diagram a group of students were surveyed about their taste in music. they were asked how they like three types of music: rock, country western and jazz. the results are summarized below: no one dislikes all three types of music. six like all three types of music. eleven don’t like country western. sixteen like jazz. three like country western and jazz, but not rock. six don’t like rock. eight like rock and country western. seven don’t like jazz. how many students were surveyed?