In the Addam's family, there is an autosomal dominant trait in which the second toe is longer than the big toe. Wednesday and Morticia both have the mutant allele, but Wednesday's second toe is longer than her big toe while Morticia's big toe is longer than her second toe. This means that the phenotype is:

Wednesday expresses the mutant allele while Morticia does not express it.

Explanation:

The allele being present in both Wednesday and Morticia, have varying expressions phenotypically. It can easily be told, looking at Wednesday's feet that she carries the allele for a longer second toe while looking at Morticia, one could assume she doesn't carry the mutant allele. However, genotypically, she is a carrier just as Wednesday is.

the diploid number of chromosomes is sometimes represented by the symbol 2n. for the fruit fly, the diploid number is 8, which can be written as 2n = 8, where n represents twice the number of chromosomes in a sperm or egg cell.

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