The D and F loci are 18 map units apart on Drosophila chromosome 3. dd mutants have pale brown dilute bristles and ff mutants have furry antennae. A pure-breeding furry fly is crossed to a pure-breeding pale brown dilute fly for the Parental (P) generation. Show the genotypes of P, the F1 and the F1 testcross progeny. Indicate the four testcross progeny phenotypes, and the expected numbers for each phenotype if there are a total of 436 F1 testcross progeny flies. Show your calculations

Development of new communities in disturbed environments, such as a burned or a clear cut forest, is called

1. variations in a population of moths allow for some of its members to be able to adapt to environmental changes. the better adapted of the moths will be able to survive the change and thus prevail as the “fittest” of the species. (a) describe three mechanisms in which variation can occur within a species population. (b) explain which mechanism or mechanisms would be responsible for the survival of a population of peppered moths better than white moths in an environment affected by industrial soot. justify your answer.

All ova contain sex chromosomes corresponding to: x y xx xy