Sex Linkage (AQA A-Level Biology): Flashcards

XX (two X chromosomes)

XY (one X, one Y)

Y is considerably smaller than X

All contain a single X chromosome

Half contain X, half contain Y

Genes located on X or Y chromosome

Only one X chromosome, no compensation possible

$X^H X^h$ - heterozygous, don't express condition

No - sons inherit Y from father, not X

All are carriers ($X^H X^h$)