[Campbell Biology P.361] Which two processes described in this chapter establish the proper ... | Practice Question

Which two processes described in this chapter establish the proper dosage of certain genes by ensuring cells have only one active copy?

  • A: X inactivation and genomic imprinting
  • B: Nondisjunction and aneuploidy
  • C: Crossing over and independent assortment
  • D: Sex-linkage and mitochondrial inheritance

Explanation

X inactivation ensures that females XX have the same effective dose of X-linked genes as males XY by silencing one X chromosome. Genomic imprinting silences one allele of certain autosomal genes based on parental origin. Both processes result in the expression of only one active copy of the affected genes.