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Question : How do Mendel's experiments show that traits may be dominant or recessive?

Answer»

SOLUTION :Through his monohybrid cross, Mendel SHOWED that the traits may be dominant or recessive. He crossed true-breeding tall (TT) and dwarf (tt) pea plants. The SEEDS formed as a result of fertilisation were grown. They form the first filial or F, generation. All the `F_1` plants obtained were tall. Not a single dwarf plant was produced.
Mendel self-pollinated the `F_1`plants to obtain the next generation of offsprings- `F_2` generation. To his surprise, he observed that not all the F, generation plants were tall. One FOURTH of the plants were short while the rest were tall.
Hence, Mendel CONCLUDED that:
a] The F, tall plants were not true breeding, they were carrying traits of both short and tall, but only the tall traits got expressed.
b] The factor for the tall trait was dominant over the dwarf trait thereby masking the dwarf trait from getting expressed.
c] Hence, "The traits may be dominant or recessive" This was the interpretation of Mendel on observing the results of his experiments.


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