It is possible that the mother of a male anomalous trichromat might have

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Anomalous trichromacy is a type of color vision deficiency inherited in an X-linked recessive manner. Since males have only one X chromosome, a male with this condition must have inherited the affected X chromosome from his mother. Women with one normal and one affected X chromosome (heterozygotes) can have superior color vision due to the presence of more types of cone cells in their retinas, a condition sometimes referred to as tetrachromacy.

It Is Possible That the Mother of a Male Anomalous