When the number of trinucleotide repeats in a gene is significantly above normal,it can produce a mutant phenotype.

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This is true. The expansion of trinucleotide repeats in certain genes can cause a range of disorders known as trinucleotide repeat expansion disorders, which include Huntington's disease, fragile X syndrome, and myotonic dystrophy, among others. These disorders exhibit a wide range of symptoms, including neurological dysfunction, developmental delays, and muscle wasting, among others, depending on the gene affected and the length of the trinucleotide repeat expansion.

When the Number of Trinucleotide Repeats in a Gene Is