What evidence disproves lamarcks theory of evolution?

Lamarck's theory of evolution posited that organisms could pass on traits acquired during their lifetimes to their offspring, such as a giraffe stretching its neck to reach higher leaves. However, evidence from genetics and the understanding of heredity demonstrates that traits are inherited through genes, not acquired characteristics. For instance, when a giraffe stretches its neck, the changes do not affect its DNA, so the offspring do not inherit a longer neck. Experiments in modern Biology, such as those involving selective breeding and genetic mutations, further support the principles of Darwinian evolution over Lamarckian ideas.