OBS --> organic brain syndrome
(Science: syndrome) A constellation of behavioural or psychological signs and symptoms including problems with attention, concentration, memory, confusion, anxiety, and depression caused by transient or permanent dysfunction of the brain.
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... cross the females would all be Rr and the males rY. Just write everything on a piece of paper and you'll see. for the Chi square as i mentioned (obs-exp)^2 is (23-25)^2+(22-25)^2+(24-25)^2+(31-25)^2 or just use Excel!
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