Definition of Dominant Trait. Before we can define exactly what a dominant trait is, we must first define and discuss many genetics terms. A gene, or unit of heredity, can have many different versions called alleles. There are often two kinds of alleles: Dominant allele: masks the effects of another allele; designated by an uppercase letter ; Recessive allele: effects are hidden by a dominant allele; designated by a lowercase letter ; Normally, individuals have two alleles for one gene: one from their mom and one from their dad.
Sydney is mostly a girls' name, but it is used for boys 4.31 percent of the time.
Displayed below is the baby name popularity of Sydney for girls. Sydney entered the list in 1930-1939 and reached its highest position of #23 in the U.S. in 2002, and is at #109 currently. (2014 Birth Statistics). Displayed below is an analysis of the popularity of the girl name Sydney and related names.