Quote:
It also delays for another generation the process of developing a true-breeding line.
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Strictly speaking, this is not entirely true. If the parent used for the backcross contains most of the desired genes and only one or two genes are being introgressed, a backcross can significantly speed up (or reduce the number of plants that have to be grown) the process of stabilizing a true breeding line. In other words, you are correct, but there are times when different logic is needed.