Respuesta :
It is given that an F2 generation is derived from two true-breeding parents with different characteristics for the same trait (determined by two alleles of a single gene). 33% of the F2 generation with a dominant phenotype would be expected to be true breeding.
True breeding involves breeding two homozygous parents, one of which is homozygous dominant whereas the other is homozygous recessive. Homozygous dominant is expressed by two capital letters e.g. 'BB' while homozygous recessive is described using two lower case letters eg. 'bb'.
In the cross-breeding experiments on pea plants by Mendel, 'B' indicates the dominant allele for the flower color i.e. purple. All the offspring in the F1 generation receive the Bb (heterozygous) allele combination. The phenotype is the purple flower determined by the dominant 'B' allele.
Now, an F2 generation is derived by crossbreeding two Bb individuals and the resulting possible combinations in this generation are BB, Bb, and bb. Thus, 33% of the F2 generation with a dominant phenotype are expected to be true breeding.
To learn more about F2 generation here
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