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Genes and alleles Original Scenario-Based Practice

Biology · Heredity · Biology · Mendelian Genetics

1 Biology practice questions on Genes and alleles. Questions built around original scenarios.

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  1. 1.

    Xenobiologists exploring a subterranean cave system on an exoplanet discover an unusual beetle whose carapace emits bioluminescent pulses to navigate in total darkness. Genetic analysis reveals that all beetles possess a specific DNA sequence at locus Lux1 responsible for light emission, yet some individuals carry a variant coding for an azure glow while others carry a variant producing an amber glow. Based on the principles of heredity, which statement correctly explains the relationship between the Lux1 locus and these glowing variations?

    • A) The Lux1 locus represents a single universal allele, whereas the azure and amber colors are produced by entirely unrelated non-homologous genes.
    • B) The Lux1 locus represents a specific gene responsible for light emission, while the azure and amber variants represent alternative alleles of that gene.
    • C) The azure and amber light variants are distinct genes that occupy completely different chromosomes, while Lux1 refers solely to the physical protein structure.
    • D) The Lux1 locus represents an allele that mutates in each somatic cell, while genes refer only to the observable physical traits of an organism.

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