Jakob_PS7 - ProblemSet7 1. Drosophilaembryos.(bc.For...

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Problem Set 7 MCB 104 – Section 105/106 1. Bicoid is one of several maternal effect genes required for the successful development of Drosophila embryos. You have isolated a recessive mutation in the bicoid gene (bc‐). For each cross below, list the genotypes of all F1 progeny that you predict will survive to adulthood. bc‐/+ female X bc‐/+ male bc‐/+ female X bc‐/bc‐ male bc‐/bc‐ female X bc‐/+ male 2. You are studying a recessive loss of function mutation in a fly gene called extensin . The mRNA for extensin is deposited in the egg by the mother and is required for normal proportioning of the adult fly. The endogenous gene for extensin is turned on later in development and is required for flies to grow to their normal size. Predict the genotype and the phenotype of the progeny from the crosses listed below. Choose from the following phenotypes: (1) disproportionate; (2) small; (3) small & disproportionate; (4) wild‐type.
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