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Genotype and phenotype Transitional Reasoning Practice

Biology · Heredity · Biology · Mendelian Genetics

1 Biology practice questions on Genotype and phenotype. Questions that build towards applied reasoning.

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  1. 1.

    In garden pea plants, the allele for round seeds (R) is completely dominant over the allele for wrinkled seeds (r). A botanist crosses two plants that both produce round seeds and discovers that approximately 25% of the resulting offspring produce wrinkled seeds. Based on this outcome, which statement correctly describes the relationship between the parents' phenotypes and genotypes?

    • A) Both parents possess the homozygous dominant genotype (RR) because any organism exhibiting the dominant phenotype carries identical dominant alleles.
    • B) Both parents possess the heterozygous genotype (Rr), demonstrating that individuals expressing a dominant phenotype can carry a hidden recessive allele.
    • C) One parent has the genotype RR and the other has Rr, since at least one parent must be homozygous dominant to yield round-seeded offspring.
    • D) One parent must have the recessive genotype rr because wrinkled offspring can only occur if at least one parent physically displays wrinkled seeds.

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