16.2.94 - chromosomes

Two alleles, M and N, on a pair of homologous chromosomes show the following BamHI cutting sites ( ).

DNA from homozygotes (MM and NN) and a heterozygote (MN) are completely digested with BamHI and subjected to Southern blot analysis using the -labeled probe as indicated above. Which autoradiogram pattern would be observed? -- a. || b. || c. || d.