Read through the instructions and introductory information. Within each group a trait can be specified for either the male or the female. If one of the parents has a mutation, then the other parent must be wild-type. Virtual FlyLab restricts you to selecting one mutation from each group. Use the radio buttons to choose a combination of genetic traits for the parent flies.
Wild type is the default, which represents a normal fly.
If you select a mutation and the mutation is not lethal, the male or female fly is made homozygous for the selected mutation. All the other traits within that group will be homozygous for the wild type allele. If you select a mutation within a group and the mutation is lethal, the fly is made heterozygous for that mutation. If you select three or more lethal mutations in the same linkage group, Virtual FlyLab will divide the alleles as evenly as possible between the two homologous chromosomes. As in the real fruit fly species D. melanogaster , crossing over occurs in females only.