In mammals, females have two copies of the X chromosome, whereas males have only one copy. Dosage compensation is accomplished in mammals by:
A. females inactivating the X chromosome
from the mother in all the cells.
B. males inactivating the X chromosome from
the father in all the cells.
C. females expressing the X-encoded genes
at 2 times the level of the male.
D. males expressing the X-encoded genes at
half the level of the female.
E. females possessing a randomly inactivated
X chromosome in all cells.
E
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Many bacteria facilitate the uptake of iron by secreting low molecular weight molecules, called ________, to form complexes with the iron that can then be readily transported into the cell.
Fill in the blank(s) with the appropriate word(s).
The production of pollen, seeds, and flowers attributed to the widespread distribution of angiosperms. Why is the production of seeds an advantage?
A. It allows fertilization in the absence of water. B. It protects and nourishes the embryo. C. It promotes pollination. D. It allows fertilization in moist areas. E. It is necessary for sexual reproduction.
What is overexploitation?
What will be an ideal response?