The insertion sites of a transgene in Drosophila can be revealed by in situ hybridization of a suitable probe to polytene chromosomes. All cells in a field must be fully determined. A field will form a well-proportioned organ even if its size is experimentally reduced or increased. Vertebrate limbs are formed from embryonic fields. Complete each of the following sentences by inserting one word into each blank space so that a scientifically and linguistically correct statement results.
Hyphenated words count as one word.
Recapitulations and Atavisms A. Define in general terms phylogenetic recapitulations in development and illustrate the phenomenon briefly with one example. B. Define in general terms atavisms and name two examples. B. Characterize in one word the biochemical function of bicoid protein. D. Name one additional target gene of bicoid protein. Patterning Genes in Drosophila A. Name the classes of genes are involved in specifying the anteroposterior body pattern of Drosophila, and name one gene as an example.