Assume that you are studying a trait determined by a number of polygenes. If there are seven phenotypic categories, how many genes are probably involved?
A) 3 B) 7 C) 2 D) 4
Answer: A
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Mitochondrial DNA (mtDNA) in humans
A. is always donated to the offspring from both parents. B. can be used to identify related people. C. can be isolated only from intact embryos. D. can be used to establish paternity.
The partial pressure of atmospheric oxygen gas at sea
level is about a. 0.3 mm Hg. b. 160 mm Hg. c. 300 mm Hg. d. 592 mm Hg. e. 745 mm Hg.
Scientists supporting phyletic gradualism explain any period of stasis in the fossil record as stabilizing selection
___________ Indicate whether the statement is true or false.
When a virus infects a bacterial cell, often new viruses are assembled and released when the host bacterial cell is lysed. If these new viruses go on to infect new bacterial cells the host cells may not be lysed
What is the most plausible explanation for this? A) The bacterial cell must be resistant to infection by the virus. B) The virus carries genes that confer resistance to the host bacterial cell. C) The host bacterium couples the viral infection with transformation. D) The virus has entered the genome of the bacterial cell and is in the lysogenic stage.