Which of the following is evidence supporting the Lyon hypothesis of X inactivation?
A. Female mammals that are heterozygous for X-linked traits are phenotypic mosaics.
B. A highly condensed structure is consistently observed in female cells, but not in normal male cells.
C. A female cat that is homozygous for coat color cannot have a calico phenotype.
D. Calico patterns of coat color are never exactly the same.
E. All of these are correct
E. All of these are correct
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A mature collection of species, called a ____ ____ , makes up the final stage of succession
Fill in the blank with the appropriate word.
Which statement related to gymnosperm reproduction is true?
A) Spores produce pollen grains, which contain sperm. B) Two sperm are required to fertilize the ovule. C) Many gymnosperms rely on insects for pollination. D) Gymnosperm reproduction is so inefficient that gymnosperms do not grow very tall or live for very long.
Which energy-producing process is thought to have come first during cellular evolution?
a. Photosynthesis b. Glycolysis c. Oxidative phosphorylation d. All originated at the same time
Lipase is synthesized in the ____.
A. pancreas B. small intestine C. large intestine D. stomach E. liver