How was it determined that X rays are mutagenic?
What will be an ideal response?
H. J. Muller determined that a direct relationship occurred between X-linked recessive lethals and X-ray dose in Drosophila.
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Overexploitation occurs as a result of ____
a. harvesting of predators b. transformation of an ecosystem to a desert c. soil nutrient loss
d. the combined outcome of desertification and global warming e. excessive harvesting of an animal or plant species
In humans, sex determination generally depends upon
a. whether or not the X chromosome is present. b. the number of X chromosomes present. c. environment in the womb. d. whether or not the Y chromosome is present. e. how many autosomes are present
In the classification of organisms, similar genera are grouped together into a
A) phylum. B) family. C) class. D) species. E) genus.
Rejection of transplanted tissue is treated with immunosuppressive drugs that prevent the activity of B cells.
Answer the following statement true (T) or false (F)