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The Law of Independent Assortment proposes alleles for separate traits are passed independently of one another. [38] [35] That is, the biological selection of an allele for one trait has nothing to do with the selection of an allele for any other trait. Mendel found support for this law in his dihybrid cross experiments.
However, in the next generation, the green peas reappeared at a ratio of 1 green to 3 yellow. To explain this phenomenon, Mendel coined the terms "recessive" and "dominant" in reference to certain traits. In the preceding example, the green trait, which seems to have vanished in the first filial generation, is recessive, and the yellow is dominant.
The Jim Crow laws were state and local laws introduced in the Southern United States in the late 19th and early 20th centuries that enforced racial segregation, "Jim Crow" being a pejorative term for an African American. [1] The last of the Jim Crow laws were generally overturned in 1965. [2]
The one-drop rule was not made law until the early 20th century. This was decades after the Civil War, emancipation, and the Reconstruction era. It followed restoration of white supremacy in the South and the passage of Jim Crow racial segregation laws. In the 20th century, it was also associated with the rise of eugenics and ideas of racial ...
The legislature passed the law over a veto by the governor. 1911–1962: Segregation, miscegenation, voting [Statute] Passed six segregation laws: four against miscegenation and two school segregation statutes, and a voting rights statute that required electors to pass a literacy test. The state's miscegenation laws prohibited blacks as well as ...
Gregor Mendel, the Father of Genetics William Bateson Ronald Fisher. Particulate inheritance is a pattern of inheritance discovered by Mendelian genetics theorists, such as William Bateson, Ronald Fisher or Gregor Mendel himself, showing that phenotypic traits can be passed from generation to generation through "discrete particles" known as genes, which can keep their ability to be expressed ...
Milliken v. Bradley, 418 U.S. 717 (1974), was a significant United States Supreme Court case dealing with the planned desegregation busing of public school students across district lines among 53 school districts in metropolitan Detroit. [1]
Sweatt v. Painter, 339 U.S. 629 (1950), was a U.S. Supreme Court case that successfully challenged the "separate but equal" doctrine of racial segregation established by the 1896 case Plessy v.