A sex linked trait.
Sections of chromosomes that code for a trait are called genes.
A section of chromosomes that codes for a trait can be called
A sex linked trait is from a gene that is on either the x or y chromosomes
The nucleus divedes
the X chromosome
One example of a sexually influenced trait in humans would be haemophilia. The gene responsible for haemophilia is located on the X chromosome, and if a man receives a gene from his mother (men's X chromosomes always come from their mother) that is positive for this trait, he will exhibit haemophilia. Women must have two X chromosomes that are positive for haemophilia in order to exhibit the trait, because it is a recessive gene.
Sex-linked traits have alleles that are passed from parent to child on a sex chromosome.
A given gene is present on exactly two chromosomes in a somatic cell.
homologous chromosomes
The gene is carried and the trait is almost entirely found in males.
at the same place on homologous chromosomes source: Alleles of a gene reside at the same locus on homologous chromosomes.
Polygenic traits result in more variation because so many more alleles are involved in the process of reproduction.