At one gene locus in humans there are 2 alleles: one for curly hair and another for straight hair. neither allele is dominant, and heterozygous individuals have wavy hair. at a second gene locus, 3 alleles control abo blood type. the alleles at these 2 gene loci assort independently. a man with straight hair and a blood marries a woman with wavy hair and b blood. their first child has straight hair and o blood. if their second child is a boy with straight hair, what is the probability that he has a blood?
a. 25
b. 35
c. 40
d. 15

Imagine you are a student in alfred hershey and martha chase's lab in the late 1940's. you are given five test tubes with the e. coli bacteria that were infected with t2 bacteriophage that have been labeled with 32p or 35s. unfortunately, you forgot to label the tubes and are now uncertain which were 32p labeled and which were 35s labeled. you place the contents of each tube in a blender and pulse it for a few seconds to shear off the protein coats from the bacterial outer membranes. you then centrifuge the contents to seperate the protein coats and the bacterial cells. you then check for radioactivity and obtain the results shown below. which tubes contained e. coli infected with the phage labeled with 32p? select all tubes that apply.