File talk:Cousin tree (with genetic kinship).png

Male/female differences
Why have female relatives been put in round boxes, and the males in square ones? And why is there no percentage for the females? Safebreaker (talk) 09:43, 2 May 2010 (UTC)

They are in different shapes,so that you can differ them. Like when you draw a family tree. Symbols used are circle for female, triangle for male. The author probably found easier to draw squares. The percentages are the SAME for females and males that are in the same kinship.

—Preceding unsigned comment added by 212.178.234.52 (talk) 06:22, 12 July 2010 (UTC)

Percentages
In the image, it states that a brother or sister is a 50% genetic relation. Surely this is incorrect as a sibling is a 100% genetic relation (they share both parents so their genetics and family tree would be 100% the same).

Following on from this, aunts and uncle would be 50% (as they are 100% relations of the mother/father), thus first cousins would be 25%. Olliffe Φ  Obscurity  09:03, 16 May 2010 (UTC)

Nope.

Jane has 50% genetics from mom, and other 50% from dad. That numbers can't change. Peter also takes 50% from mom. Those 50% which Peter inherited from his mom can be completely same as Janes 50% (that would be 100% kinship on between Jane and Peter, concerning chromosomes inherited from mothers side).

Also those 50% which Peter inherited from his mom could be the part of mothers genome that Jane did not inherit (which would mean 0% kinship between Peter and Jane, concerning chromosomes inherited from mothers side).

The same story goes for the father side. So, for brother and sister, half of their chromosomes is inherited from mother and is probably 50% same, and the other half inherited from dad is also probably 50% same. Total is 1/4 + 1/4 = 1/2 = 50%

The AVERAGE is 50% gentic kinship between brother and sister.

Also there is CERTAIN 50% (no less, no more) genetic kinship between mother and daughter. —Preceding unsigned comment added by 212.178.234.52 (talk) 06:36, 12 July 2010 (UTC)