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17. Which of the following is FALSE about Barr bodies in mammals? A. Females are genetic mosaics for heterozygous X-linked genes. B. Females are genetic mosaics for homozygous X-linked genes. C. Males are genetic mosaics for hemizygous X-linked genes. D. Females are genetic mosaics for heterozygous autosomal genes. E. Select this answer if more than one of the answers A-D are false. 18. Junior Scientist mates two haploid strains of yeast. Neither strain is able to synthesize the amino acid histidine. That is, each haploid strain requires addition of histidine to minimal medium to grow. However, after crossing the two mutants, the resulting diploid strain grows well on minimal nutrient medium without the addition of histidine. Which of the following can be confidently concluded from this experiment? A. Both auxotrophic mutants have mutations in the same gene, which encodes an enzyme required for histidine biosynthesis. B. The auxotrophic mutants have mutations in different genes that each encode an enzyme required for histidine biosynthesis. This is an example of genetic complementation. C. For at least one of the mutants, there has been a spontaneous mutation that returned the gene to the wild-type. D. The data are best explained as an epistatic interaction. E. This is a clear example of codominance.

          17. Which of the following is FALSE about Barr bodies in mammals?
A. Females are genetic mosaics for heterozygous X-linked genes.
B. Females are genetic mosaics for homozygous X-linked genes.
C. Males are genetic mosaics for hemizygous X-linked genes.
D. Females are genetic mosaics for heterozygous autosomal genes.
E. Select this answer if more than one of the answers A-D are false.

18. Junior Scientist mates two haploid strains of yeast. Neither strain is able to synthesize the amino acid histidine. That is, each haploid strain requires addition of histidine to minimal medium to grow. However, after crossing the two mutants, the resulting diploid strain grows well on minimal nutrient medium without the addition of histidine. Which of the following can be confidently concluded from this experiment?
A. Both auxotrophic mutants have mutations in the same gene, which encodes an enzyme required for histidine biosynthesis.
B. The auxotrophic mutants have mutations in different genes that each encode an enzyme required for histidine biosynthesis. This is an example of genetic complementation.
C. For at least one of the mutants, there has been a spontaneous mutation that returned the gene to the wild-type.
D. The data are best explained as an epistatic interaction.
E. This is a clear example of codominance.

17. Which of the following is FALSE about Barr bodies in mammals?
A. Females are genetic mosaics for heterozygous X-linked genes.
B. Females are genetic mosaics for homozygous X-linked genes.
C. Males are genetic mosaics for hemizygous X-linked genes.
D. Females are genetic mosaics for heterozygous autosomal genes.
E. Select this answer if more than one of the answers A-D are false.

18. Junior Scientist mates two haploid strains of yeast. Neither strain is able to synthesize the amino acid histidine. That is, each haploid strain requires addition of histidine to minimal medium to grow. However, after crossing the two mutants, the resulting diploid strain grows well on minimal nutrient medium without the addition of histidine. Which of the following can be confidently concluded from this experiment?
A. Both auxotrophic mutants have mutations in the same gene, which encodes an enzyme required for histidine biosynthesis.
B. The auxotrophic mutants have mutations in different genes that each encode an enzyme required for histidine biosynthesis. This is an example of genetic complementation.
C. For at least one of the mutants, there has been a spontaneous mutation that returned the gene to the wild-type.
D. The data are best explained as an epistatic interaction.
E. This is a clear example of codominance.

Added by Chris H.

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