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Punnett squares Original Scenario-Based Practice

Biology · Heredity · Biology · Mendelian Genetics

1 Biology practice questions on Punnett squares. Questions built around original scenarios.

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Questions

  1. 1.

    In an underground bioluminescent grove, cavern beetles possess either iridescent shells governed by a dominant allele (B) or matte black shells governed by a recessive allele (b). A researcher mates two iridescent beetles that are both confirmed to be heterozygous (Bb). Using a Punnett square for this cross, what fraction of the total offspring is predicted to display iridescent shells while also carrying the recessive allele?

    • A) 1/4 (25%)
    • B) 2/4 (50%)
    • C) 3/4 (75%)
    • D) 4/4 (100%)

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