The chances of getting the recessive alba version depend on how many genes are involved.
If it is a single gene, you should get one in 4 = 25% true albas.
If there are two genes involved, you should get one in 16 = 6.25% true albas.
However, orchid genetics are not always that simple (that you can apply Mendel's rules). I was investigating a case, where 1100 seedlings produced 1050 short plants (under 12" tall), and 50 tall plants (ranging up to 48" tall). That is about 4.5%; can't quite work out the math for that to happen.
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Kim (Fair Orchids)
Founder of SPCOP (Society to Prevention of Cruelty to Orchid People), with the goal of barring the taxonomists from tinkering with established genera!
I am neither a 'lumper' nor a 'splitter', but I refuse to re-write millions of labels.
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