Describe two dosage compensation mechanisms found in animals
What will be an ideal response?
X-inactivation in females, in which one X chromosome is silenced, and X-hyperactivation in males, in which genes on the X chromosome have increased expression.
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Which major tissue type often has more extracellular matrix material than cellular material?
a. epithelial tissue b. connective tissue c. muscle tissue d. nervous tissue e. skin tissue
Indicate if the conditions described would result in the development of a male or a female individual. SRY is a gene on the Y chromosome that is involved in initiating development of the male phenotype in humans.
When is a cell in metaphase?
a. The chromosomes are visible as threadlike structures. b. The nuclear envelope is clearly visible. c. The chromosomes are aligned at the midplane of the cell. d. The chromosome are separated into distinct groups at opposite poles of the cell. e. Cytokinesis is occurring
What limits the frequency of the action potentials?
A. Refractory period B. Spike amplitude C. Chloride ions D. Nodes of Ranvier