The allele for colorblindness is located on the X chromosome, so it isNormally, colorblindness is atraitand requires two copies of the allele. Sincehave twoX chromosomes, they do not exhibit any symptoms if they have onlyone colorblindness allele. However. sincehave onlyone X chromosome, they need to inherit the allele only once toexpress the trait.

The allele for colorblindness is located on the X chromosome so it isNormally colorblindness is atraitand requires two copies of the allele Sincehave twoX chrom class=

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The allele for colorblindness is located on the X chromosome, so it is sex-linked. Normally, colorblindness is a recessive trait, and requires two copies of the allele. Sincefemales_ have two X chromosomes, they do not exhibit any symptoms if they have only one colorblindness allele. However, sincemales_ have only one X chromosome, they need to inherit the allele only once to express the trait.