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a
undergoes continuous cross- pollination and plays a key role in evolution because of its unstable hereditary expression for several generations.
b
undergoes continuous self- pollination and is highly unstable but plays a key role in evolution.
c
undergoes continuous cross- pollination and shows the stable inheritance and expression for several generations.
d
undergoes continuous self- pollination and shows the stable inheritance and expression for several generations.
answer is D.
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Detailed Solution
A true breeding line is the one that has undergone continuous self- pollination and shows the stable inheritance and expression for several generations.