When a farmer grows cotton containing the gene for Bt toxin, insects that are resistant (rr) survive and reproduce. This is an example of Select one:
a. natural selection.
b. dominance.
c. independent assortment.
d. recombination.
e. genetic drift.
a. natural selection.
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Most chromosomes are paired and are both inherited from either the mother or the father
A. true B. false
What feature makes morganucodonts transitional species?
a. cold-blooded, but had fur b. jaw that features both mammalian and reptilian characteristics c. both scales and fur d. egg-laying, but had fur and endothermy
The interleukin-2 (IL-2) growth factor interacts with receptors on
A) embryonic cells. B) cytotoxic T lymphocytes. C) mesenchymal cells. D) smooth muscle cells. E) epithelial cells.
What would happen to a cell if all of its peroxisomes were to suddenly rupture?
a. the cell would be unharmed b. the cell would stop performing cleanup and recycling of debris c. the cell would undergo uncontrollable, random chemical reactions d. the cell would stop making proteins