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Test crosses Original Scenario-Based Practice

Biology · Heredity · Biology · Mendelian Genetics

1 Biology practice questions on Test crosses. Questions built around original scenarios.

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Questions

  1. 1.

    Deep within an uncharted cavern, an explorer discovers a bioluminescent mushroom species where glowing silver caps are dominant over dull grey caps. To determine whether a prized glowing silver specimen is homozygous dominant or heterozygous, the explorer conducts a standard test cross by mating it with a dull grey specimen. The resulting spore brood produces 48 glowing silver mushrooms and 52 dull grey mushrooms. Which conclusion correctly identifies the genotype of the mystery parent and the genetic outcome of this cross?

    • A) The mystery parent is heterozygous, resulting in approximately a 1:1 ratio of heterozygous to homozygous recessive offspring.
    • B) The mystery parent is homozygous dominant, resulting in a 1:1 ratio of dominant to recessive offspring.
    • C) The mystery parent is heterozygous, resulting in a 3:1 ratio of heterozygous to homozygous dominant offspring.
    • D) The mystery parent is homozygous recessive, resulting in all offspring inheriting identical homozygous genotypes.

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