Individuals Heterozygous for the RB⁺ and RB^- Alleles Can Develop

question 35

Multiple Choice

Individuals heterozygous for the RB⁺ and RB^- alleles can develop tumors as a result of

• A)a mitotic crossover that leads to homozygosity for both RB⁺ and RB^-.
• B)a somatic mutation in the RB⁺ allele that leads to homozygosity for RB^-.
• C)a somatic mutation in the RB^- allele that leads to homozygosity for RB⁺.
• D)the fact that RB^- is dominant to RB⁺.
• E)a mitotic crossover that leads to homozygosity for both RB⁺ and RB^- and a somatic mutation in the RB⁺ allele that leads to homozygosity for RB^-.

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