1 Colored Egg Layer Chickens. The Araucana is a pure breed of chicken originating in Chile. 2  Ameraucana chickens were developed in the 1970âs in the United States from Araucanas. They were developed as a practical barnyard fowl that laid pastel shelled eggs, but without some of the limiting genetic factors related to rumplessness and tufts.
sex chromosome. a chromosome, differing in shape or function from other chromosomes, that determines the sex of an individual.
genes located on sex chromosomes are called sex-linked genes. In humans, there are two types of sex chromosomes: X and Y chromosomes. Genes located on the X chromosome are c â¦ alled X-linked and genes located on the Y chromosome are called Y-linked chromosomes.4 people found this useful. Bonnie Peregrine.n humans, there are two types of sex chromosomes: X and Y chromosomes. Genes located on the X chromosome are c â¦ alled X-linked and genes located on the Y chromosome are called Y-linked chromosomes. 4 people found this useful.