Night-blindness is an inherited condition in which people have unusually poor vision when light levels are low.
The diagram shows the inheritance of night-blindness in three generations of a family.
Couple 4 and 5 are expecting their second child, individual 7.
What is the probability that individual 7 will be a male and will also show night-blindness as his phenotype?
1 )
0.500
2 )
0.300
3 )
0.250
0.125
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