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Although familial cases of narcolepsy have been reported, most human occurrences are sporadic, and the disorder is generally

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Answer #1

1: Dogs were used for the testing. Phenotype: All affected with nacrolepsy (homozygous recessive for the gene).
3: Dominance test refer to the cross wherein a F1 hybrid is crossed with recessive parent to decipher its genotype. Attached image encircle the one from the given pedigree.

個GEE GM Dominace test
4: Complementation test could have done by taking affected dogs from different breeds and crossing them. For example: Affected Labrador could have crossed with affected poodle or bull dog.
If the progeny showed normal phenotype with respect to selected disease, the genes responsible for disease in two breeds complemented each other.

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