The most precise method of obtaining estimates of the absolute ages of geological deposits is
A. measure rates of sedimentary rock formation.
B. measure the ratios of various radioactive isotopes in the deposits.
C. apply the principle of superposition (younger deposits above older deposits).
D. make salinity measurements in ocean sediment deposits.
E. study the sequence of fossil types in the deposits.
B. measure the ratios of various radioactive isotopes in the deposits.
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A(n) ____________________ organism is one that carries a gene that has been transferred to it from another species
Fill in the blank(s) with correct word
For Mendel's explanation of inheritance to be correct, ____
a. the genes for the traits he studied must be located on the same chromosome b. the combination of gametes at fertilization must be due to chance c. genes cannot be transmitted independently of each other d. only diploid organisms demonstrate inheritance patterns e. only triploid organisms demonstrate inheritance patterns
The ________ is responsible for deep-seated emotions, including sex, hunger, thirst, pain, anger, and pleasure.
A. hypothalamus B. cerebellum C. limbic system D. pituitary gland
A gene that specifies the fate of a particular anatomical segment in Drosophila is called a(n) ________
A) silent gene B) MADS genes C) determinant genes D) selector gene