Which is true of sex-linked genes?
they are important only in sex determination.
they may be on one sex chromosome and not the other.
they always produce traits that are codominant.
they always represent recessively inherited disorders.

Color blindedness is a sex-linked trait. if we could see the pedigree chart for several more generations of the family illustrated here, we would expect a) more males to be color blind. eliminate b) more females to be color blind. c) no females to ever be color blind. d) an equal number of males and females that are color blind.