However, researchers in Morgan’s laboratory suggested that alleles positioned on the same chromosome were not always inherited together. That each chromosome can carry many linked genes explains how individuals can have many more traits than they have chromosomes. This also demonstrated that linked genes disrupt Mendel’s predicted outcomes. Morgan identified a 1:1 correspondence between a segregating trait and the X chromosome, suggesting that random chromosome segregation was the physical basis of Mendel’s model. Mendel’s work suggested that traits are inherited independently of each other. Then, after several years of carrying out crosses with the fruit fly, Drosophila melanogaster, Thomas Hunt Morgan provided additional experimental evidence to support the Chromosomal Theory of Inheritance. About ten years after the theory was proposed, Eleanor Carothers was the first to discover physical evidence supporting it she observed independent chromosome assortment in grasshoppers. Critics pointed out that individuals had far more independently segregating traits than they had chromosomes. ![]()
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