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You mate a female m1 fly to a male m3 fly. if these two flies have recessive mutations in the same gene, what percentage of their offspring will have sleep defects?

Sagot :

There is only 50 %  chance that offspring have a sleep defects. The simplest test to distinguished between the two possibilities is the complementation test.

When two recessive organism are crossed then mutation are in the same gene , both copies of gene will be mutant in F1 offspring and they will exhibit the same phenotype as their parents.

The exact mutation may be different but both allele of single gene are mutant and the recessive phenotype will be  observed. If two mutants have homozygous recessive mutant alleles for two different genes. Complementations is occurs when two strains of an organisms with different homozygous recessive mutations that produce the same mutant phenotype.

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