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Question

How many contrasting characters were used by Mendel to formulate the laws of inheritance?

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RRB Group D 2024 Question Paper PDF (27-Dec-2025) (Shift 2)
The correct answer is

7

Gregor Johann Mendel, the "Father of Genetics", carried out his classic experiments on the garden pea (Pisum sativum) and studied 7 pairs of contrasting characters to formulate his laws of inheritance.

These seven traits were: seed shape (round/wrinkled), seed colour (yellow/green), flower colour (violet/white), pod shape (inflated/constricted), pod colour (green/yellow), flower position (axial/terminal) and stem height (tall/dwarf). By tracking how these clear-cut alternative forms passed to offspring, Mendel deduced the Laws of Dominance, Segregation and Independent Assortment.

The other options (5, 8 and 4) do not match the well-documented number of contrasting characters Mendel actually used, which is seven.

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