Tom is colorblind, but his wife Mary is not. Their son is colorblind. Colorblindness is a sex- linked trait. Tom\'s wife is Select one; Homozygous for colorblindness Homozygous for normal vision or heterozygous for normal vision. Homozygous for normal vision. Heterozygous for normal vision. Solution Heterozygous for normal vision X-linked color blindness is a recessive trait. Tom’s wife is heterozygous for this trait have normal vision. Females heterozygous for this trait have normal vision. The color perception defect manifests itself in Tom’s wife only when it is inherited from both parents. By contrast, Tom inherit their single X-chromosome from their mothers and become color blind if this X- chromosome has the color perception defect.