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Biology · 2025 · 3 marks
CBSE 2025 · Region 4 · Set 3 · Q23
Gregor Mendel used true-breeding pea lines to conduct his hybridisation experiments in garden pea. (a) Explain what is meant by true-breeding pea…
Gregor Mendel used true-breeding pea lines to conduct his hybridisation experiments in garden pea.
(a)
Explain what is meant by true-breeding pea lines.
(b)
State the three important points of law of dominance as proposed by Gregor Mendel.
Marking-scheme solution
(a)
True-breeding line is one that having undergone continuous self-pollination, shows the stable trait inheritance, and expression for several generations.
(b)
Law of dominance
–
Characters are controlled by discrete unit called factors
–
Factors occur in pairs.
–
In a dissimilar pair of factors one member of the pair dominates (dominant) the other (recessive).
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