In a cross between a pea plant heterozygous for round seeds (Rr) and a plant with wrinkled seeds (rr), what is the expected phenotypic ratio of the offspring?
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In a monohybrid cross involving a heterozygous parent (Rr) and a homozygous recessive parent (rr), the phenotypic ratio is always 1:1, as half the offspring inherit the dominant allele and half inherit the recessive allele.