Genetic variation Transitional Reasoning Practice

Questions

1. 1.

   A geneticist analyzes gamete production in a diploid animal with the genotype AaBbCc, where each gene locus resides on a separate homologous autosome. Even when crossing over is completely inhibited during prophase I, the individual still produces eight genetically distinct types of haploid gametes in equal proportions. Which cellular mechanism directly explains the generation of these distinct allele combinations under these conditions?

   • A) Random fusion of distinct gametes during sexual fertilization
   • B) Spontaneous point mutations occurring during DNA replication in interphase
   • C) Separation of identical sister chromatids during meiotic anaphase II
   • D) Independent assortment resulting from the random orientation of homologous pairs at metaphase I

Answers and step-by-step solutions appear after you finish the test.