In humans, most sex linked traits are carried on the X sex chromosome.
on the X chromosome
on the X chromosome
x chromosome
sex-linked genes
chromosomes
The "X" and "Y" chromosomes.
Actually, it's chromosomes.
individuals that are heterozygous for alleles
Kennedy
Sex-linked genes, genes found on one of the sex chromosomes (X or Y) but not the other. Most sex-linked genes are X-linked because the female chromosome is longer.
Down Syndrome often occurs when chromosomes fail to separate properly during meiosis.
Males have only one X chromosome, so a recessive X-linked trait will be displayed in the phenotype [visible on the outside]. Females have two X chromosomes, so both of the chromosomes must have the trait for it to be displayed on the phenotype.