All the male relatives of a color-blind man are also color blind.This man likely received the allele for color blindness from

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Color blindness is typically inherited in an X-linked recessive manner, meaning the gene causing color blindness is located on the X chromosome. Since males have one X and one Y chromosome, a single copy of the color blindness allele on their X chromosome will result in the condition. A man cannot inherit an X chromosome from his father (he inherits the Y chromosome from his father), so the allele for color blindness must come from his mother. His mother, in turn, must have received her X chromosome carrying the color blindness allele from her father, making the man's maternal grandfather the source of the allele.

All the Male Relatives of a Color-Blind Man Are Also