Scientists may compare similar genes in different species and determine what percentage of base pairs is identical. From this, it can be estimated how long ago the two species shared a common ancestor. The validity of this conclusion depends on an
important assumption. This assumption is that:
A) all living things use the same genetic code.
B) both species belong to the same kingdom.
C) the gene codes for a functional protein.
D) mutations occur at a fairly constant rate in all evolutionary lines.
Answer: D
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a. A b. B c. C d. D e. E
The ____________________ are blood pressure receptors located in the carotid arteries. Fill in the blank(s) with the appropriate word(s)
What structures of the male and female reproductive systems share a common embryonic origin?
A. cervix and ejaculatory duct B. labia minora and penis C. clitoris and scrotum D. clitoris and penis
In sexual reproducers, meiosis gives rise to _____________.
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