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.
Sex chromosomes determine whether you are male or female. An individualâs sex (i.e., whether they are a male or female) is determined by the sex chromosomes. Most people have two sex chromosomes, one that is inherited from their mother and one that is inherited from their father. Typically, females have two X chromosomes (XX) and males have one X chromosome and one Y chromosome (XY).