Can someone explain to me why I don't understand?

Explanation:

1) Chromosomal Abnormality is an extra chromosome at 18

Gender is Male because chromosome 23 has one X chromosome and one Y chromosome.

Disorder name is Edwards Syndrome

2) Chromosomal Abnormality is an extra chromosome at 21

Gender is Female because chromosome 23 has two X chromosomes

Disorder name is Down Syndrome

there's no big difference.

explanation:

the only little different between a rabbit and bunny is just that bunnies are much smaller than rabbits. bunnies are basically baby rabbits.

friedrich meischer discovered it in white blood cell