This looks misleading to me, because it indicates that grandchildren and their descendants can have very disproportionate amounts of genes from either grandparent.

The genes inherited from a parent do not sit in one continuous chunk, as indicated here.

Instead they are pulled randomly from all over the parent's genome, and so they end up taking up places all over the offspring's genome as well.

This has the effect that relatedness is consistently halved through the generations. (Though minor variations occur in the short term)

Nobody's friend says that.

if my "friend" challenged me to explain ALL of genetics in one picture - I would go way further than that.

Wait, are rangas a dominant gene?

Fuck me, I just thought the brits were inbred!

0/10 doesn't explain the structure of Vsr-like homing endonucleases