A pea plant carrying two B alleles is crossed with a pea plant carrying two b alleles, where B is dominant to b. How many of the offspring are expected to show the dominant characteristic?

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Every gamete from the first plant carries B and every gamete from the second carries b, so each offspring receives one of each and the dominant allele decides its appearance. A three quarters figure belongs to a cross where both parents can hand on the recessive allele, and here only one of them can.