A variety of snail has an inherited condition that affects the thickness of the shell.
- S$^{\text{t}}$ S$^{\text{t}}$ have thick shells.
- S$^{\text{t}}$ S$^{\text{n}}$ have thin shells.
- S$^{\text{n}}$ S$^{\text{n}}$ do not survive.
Two heterozygous snails are mated.
What is the probability that a surviving snail of the next generation is a heterozygote?
1 )
0.00
2 )
0.25
3 )
0.50
0.67
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