________ chromosomes pair during ________ of meiosis.
Fill in the blank(s) with the appropriate word(s).
Homologous; prophase I
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T cells interact with the peptide-MHC complex using
A) cytokines. B) granzyme and perforin. C) T-cell receptors. D) the antibodies present on the surface of the cell.
In a less severe form of combined immune deficiency, the individual
A) has normal numbers of T and B cells. B) has no white blood cells. C) has some T cells but lacks B cells. D) lacks both T and B cells.
List two possible benefits of living in a group
What will be an ideal response?
The mode of natural selection in which two or more extreme phenotypes are fitter than the intermediate phenotype is
A. directional selection. B. stabilizing selection. C. disruptive selection. D. artificial selection. E. uniformitarianism.