Suppose researchers identified two Drosophila melanogaster mutant phenotypes. One phenotype is called maniac and the other is called shiny. In order to determine the mode of inheritance of the mutant allele responsible for each phenotype, males that have both mutant phenotypes are mated with wild type (wt) females to produce F1 progeny. Then the F1 progeny are mated together and the F2 progeny are scored.
F1: manaic male 393 maniac female 389 >>>>> F2: manaic male 430 manaic female 866
What is the mode of inheritance for the genes controlling maniac and shiny?
1-X-linked dominant for maniac and X-linked recessive for shiny. 2-autosomal dominant for maniac and X-linked dominant for shiny.
3-autosomal dominant for maniac and X-linked recessive for shiny. 4-autosomal recessive for maniac and autosomal recessive for shiny.
What is the genotype of the original male parent?
1. homozygous mutant at both loci. 2-hemizygous mutant at both loci. 3-homozygous mutant at one locus and hemizygous mutant at the other locus. 4. hetrozygous mutant at one locus and hemizygous mutant at the other locus.