In a three-point test cross, one parent is triple heterozygote for three genes that are on the same chromosome and the other parent is homozygous recessive for the same three genes. The dominant alleles of these genes are A, B, and D; the recessive alleles are a, b, and d. The following table shows how many offspring express certain alleles:How far are the A and B genes from each other?

MCQs on various topics in genetics, focusing on DNA, genes, and chromosomes. Topics include: crosses, mitosis and meiosis, protein synthesis, linkage, chromosome mapping, anomalies and disorders, and genetics technology and tools.