in the f₂ generation of mendels crosses,\nall plants had the dominant trait.\nhalf of the plants had the…

in the f₂ generation of mendels crosses,\nall plants had the dominant trait.\nhalf of the plants had the dominant allele.\nall plants had both the dominant and recessive alleles.\none in four plants had two alleles for the recessive trait.

in the f₂ generation of mendels crosses,\nall plants had the dominant trait.\nhalf of the plants had the dominant allele.\nall plants had both the dominant and recessive alleles.\none in four plants had two alleles for the recessive trait.

Answer

Answer:

one in four plants had two alleles for the recessive trait.

Brief Explanations:

Mendel's experiments showed that in the F₂ generation, the phenotypic ratio is 3:1 (dominant : recessive). The genotypic ratio is 1:2:1 (homozygous dominant : heterozygous : homozygous recessive). So, one - fourth (1/4) of the plants have two recessive alleles (homozygous recessive).

  • The first option is wrong as not all plants show the dominant trait (25% show recessive).
  • The second option is incorrect because half of the plants are heterozygous (have one dominant and one recessive allele), not half having the dominant allele in terms of the description in the option.
  • The third option is wrong as only heterozygous plants have both dominant and recessive alleles, while homozygous plants have either two dominant or two recessive alleles.