heterozygous parents and count the alleles.
SS
Ss
Ss
ss
We can see S S S S (4 x S) and s s s s (4 x s).
If we break them apart we can see this clearly.
SS
S
S
(Snap)
s
s
ss
Again, we know that if two heterozygous parents
are crossed that the ratios will be 50/50 with
regards to the allele.
(^) S s
S SS Ss
s Ss ss