In humans and other mammals, dosage compensation is achieved by:
A. males transcribing double the normal
amount of copies of X-chromosome genes.
B. females decreasing transcription of both X
chromosomes by ½.
C. females eliminating one X chromosome in
each cell.
D. females inactivating the paternal X
chromosome in each cell.
E. females randomly inactivating one X
chromosome in each cell.
E
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Chemolithotrophs generally derive ________ ATP from oxidation of inorganic substrates because the reduction potentials of those substrates are much more ________ than the reduction potential of organic substrates.
A. less; negative B. more; negative C. less; positive D. more; positive
Answer the following statements true (T) or false (F)
1. The covalent bonds that hold monosaccharides together in a polysaccharide are called glycosidic bonds. 2. A DNA nucleotide consists of the following three parts: a nitrogenous base, ribose, and a phosphate group. 3. The waxes in the cell walls of Mycobacterium tuberculosis cause this organism to be acid-fast. 4. The basic structure of a cell membrane is a lipid bilayer. 5. DNA polymerase is the only enzyme required for DNA replication.
Mouse pigmentation is subject to epistasis of the B alleles by the d alleles. B (black) is dominant over b (brown), and
D is dominant over d. Homozygous d is epistatic to the black and brown genes. Given this information, what genotype(s) result in a white mouse (no pigment)?
a. BBdd only b. Bbdd only c. bbDD only d. bbDd only e. BBdd and Bbdd
Which one of the following structures seen here is present in both the plant and the animal cell?
1.golgi body
2.cell wall
3.chloroplasts
4.central vacuole