Sex Linkage (Leaving Cert Biology): Flashcards

Gene located on a sex chromosome

XX

XY

Red-green colour blindness and haemophilia

Inability to distinguish between red and green

Inability to form blood clots properly

Males need only one recessive gene on their single X chromosome to express the trait

Heterozygous females who don't express the trait but can pass it to offspring

$X^n Y$

$X^n X^n$

$X^N X^n$

$X^N Y$