Describe the maternal age effect associated with Down syndrome
What will be an ideal response?
For unknown reasons, the nondisjunctional event that produces Down syndrome occurs more frequently during oogenesis in women older than age 35.
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__________ is a term that refers to similarities among various species that occur because the species are derived from a common ancestor.
A. Homologue. B. Phylogeny. C. Homology. D. Heterology. E. Morphology.
A pure culture contains
A. a variety of species from the same genus. B. only one identified species of microorganism. C. microbes from a single source. D. only bacteria.
Which of the following areas in a secondary lymphoid organ allows intimate contact between blood and the lymphocytes?
What will be an ideal response?
What is the name of the process by which one cell divides its material into two smaller cells?
a. interkinesis. b. reduction division. c. synapsis. d. cytokinesis. e. karyokinesis.