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Dominant and Recessive Alleles
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In a pea plant, the allele for purple flowers (P) is dominant over the allele for white flowers (p). If a homozygous purple-flowered plant (PP) is crossed with a homozygous white-flowered plant (pp), what will be the genotype and phenotype of the offspring?
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A
All offspring will be heterozygous (Pp) and have purple flowers.
💡 Explanation:
Since the dominant allele (P) for purple flowers masks the expression of the recessive allele (p) for white flowers, all offspring will inherit one dominant allele (P) from the purple-flowered parent and one recessive allele (p) from the white-flowered parent, resulting in a heterozygous genotype (Pp). This genotype will express the dominant trait, which is purple flowers.