An unusual phenotype in Drosophila is singed bristles.  Flie…

An unusual phenotype in Drosophila is singed bristles.  Flies with singed bristles look like they have survived an encounter with a blowtorch!  A geneticist first created a purebred culture of flies with singed bristles and then bred those flies with a purebred culture of wild flies (with normal bristles).  In the F1 generation, all flies had normal wild-type bristles.  When the F1 flies were allowed to mate among themselves, the following F2 generation was produced: 70 flies with singed bristles and 166 flies with normal bristles.  Determine a proposed inheritance of singed bristles and analyze the F2 data using chi-square (X2, chi-square) analysis. 

Directions: Answer questions A-D below. Use letters A-D to i…

Directions: Answer questions A-D below. Use letters A-D to indicate which part of the question you are answering. Two organisms, AABBCCDDEE and aabbccddee, are mated to produce an F1 that is self-fertilized. If the capital letters represent dominant, independently assorting alleles: A. How many different genotypes will occur in the F2? _________ B. What proportion of the F2 genotypes will be recessive for all five loci? ______   C. Would you change your answers to part (a) and or part (b) if the initial cross occurred between AAbbCCddee x aaBBccDDEE parents?   D. Would you change your answers to part (a) and/or part (b) if the initial cross occurred between AABBCCDDEE x aabbccddEE parents?