Suppose there are three new eye colour mutants in Drosophila, called mutant A, m

Question

Suppose there are three new eye colour mutants in Drosophila, called mutant A, mutant B and mutant C. To find out if these new mutant alleles are in a gene already known to be involved in eye colour, crosses for complementation tests were performed; the new mutants were crossed to mutant C mutants in four different genes already known to wildtype control eye colour: rosy, brown, cinnabar and scarlet. The results are shown in the table. mutant A mutant B mutant C mutant B rosy null brown null Explain what the complementation results indicate cinnabar null+ about each of the three new mutants: mutant A, mutant B and mutant C. 10 marks] indicates progeny had wildtype eye phenotype indicates progeny had mutant eye phenotype

Explanation / Answer

As per the complementation test given here,

It can be seen that mutant allele A is present on gene coding mutant C, rosy null

Mutant B is on same gene as mutant c and cinnabar null

mutant c allele is present on all the genes.

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