Bacterial genes can be transferred from one bacterium to another by different mechanisms. The newly
introduced DNA can:
a. recombine with DNA already present.
b. generate genetic variability.
c. exchange alleles between homologous regions from two different individuals.
d. allow growth on minimal media
e. all of these
E
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What are 3 human activities that negatively affect sea turtle survival?
What will be an ideal response?
Blood is prevented from back flowing in veins
because of
a. high pressure flow. b. rapid diffusion. c. one-way valves. d. suction from the lungs. e. the pulsing of the veins.
"Since every cell in this patient's body has the same genetic change, it is most likely that . . ."
A. he acquired this change from one of his parents. B. he was exposed to mutagenic agents. C. his mother was the only source of the mutant gene. D. All of the choices are true.
In humans, if nondisjunction led to an individual with a genotype of XO, that person would
A. display both male and female characteristics. B. be male because each cell has only one X chromosome. C. not survive. D. be female because each cell lacks a Y chromosome.