Abstract
II. Linkage and Crossing-over MENDEL'S second law has been found to be restricted in its application. Two pairs of characters do not always assort independently. This fact was first observed by Bateson and Punnett in 1905, and called gametic coupling—not that gametes (ripe germ-cells) are coupled, but that when certain genes enter together from one parent they tend to hold together, as though coupled, in later generations. A specific case will serve to illustrate this kind of inheritance.
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MORGAN, T. The Mechanism of Heredity1. Nature 109, 275–278 (1922). https://doi.org/10.1038/109275a0
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DOI: https://doi.org/10.1038/109275a0