Why doesn't the trait for albinism in plants disappear
considering that albino plants die before producing seeds?
This is the same question asked about many harmful genetic traits such as
genetic diseases. Every organism receives two copies of each gene: one
from each parent. So there is always the possibility of having one bad
copy that is hidden by the good copy. If both parents then have one bad
copy each but are normal themselves, they have a 25 percent chance of having
offspring with the trait. The only way of getting rid of the bad gene from
the gene pool is to never let carriers mate. So there will always be carriers
to pass on the bad gene.
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Update: June 2012