Since they can only pass on an "X" sex chromosome, females are known as a homogametic sex.

Name: Since they can only pass on an "X" sex chromosome, females are known as a homogametic sex.
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Females have two X chromosomes (XX) and can only pass on an X chromosome to their offspring, making them the homogametic sex, in contrast to males who have one X and one Y chromosome (XY) and can pass on either, making them the heterogametic sex.

Since They Can Only Pass on an "X" Sex Chromosome