difficult Q from nbde 1..need help

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ddsfight

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Hi
I need help in solving these Qs
I have Q from 97 paper from biochem/physio.
Assuming that P50=26 torrs under conditions where PO2=30torrs, the avarage no. of O2 mole. bound per Hb mole is closet to

A-0.5
B-less than 1
c -almost 1
D-greater than 2
E-greater than3

Answer is D but could not find the reason behind it.

2nd Q from micro
The autosomal dominant trait showing 50 % penetrance will be phenotypically expressed in what % of the offspring

o
25
33
50
75

Answer is 25 but don't know why?
 
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