Class 10 Science - Chapter Heredity and Evolution NCERT Solutions | How do Mendel’s experiments show t
How do Mendel’s experiments show that traits may be dominant or recessive?
The allele which always expresses itself in the presence of contrasting allele is a dominant allele and which does not express itself in the presence of its contrasting dominant allele is known as recessive allele.
Mendel showed the traits dominant or recessive by the monohybrid cross which is shown by the law of dominance in pea plants, in which the allele is expressed itself is dominant or the unexpressed one is recessive. He crossed the homozygous tall pea plant with genotype TT to the homozygous dwarf pea plant with genotype tt. Then, the F1 (filial generation) is formed with the result of phenotype Tt where T shows the tallness, i.e, dominant or t shows the dwarfness which remain unexpressed, i.e, recessive. And when he crossed again, he found the 3:1 phenotypic ratio and 1:2:1 genotypic ratio in F2 generation.
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