A mixed culture is
A. one that has been adequately stirred.
B. a pond sample containing algae and protozoa.
C. one that contains two or more known species.
D. the same as a contaminated culture.
C. one that contains two or more known species.
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At an autosomal gene locus in humans, the allele for brown eyes is dominant over the allele for blue eyes. At another gene locus, located on the X chromosome, a recessive allele produces colorblindness while the dominant allele produces normal color vision. A heterozygous brown-eyed woman who is a carrier of colorblindness has a child with a blue-eyed man who is not colorblind. An ultrasound test shows that the child is a girl. What is the probability that she will be colorblind? (Enter the probability as a percent. Enter the number only without the percent sign. For example, enter 100% as 100 and enter 12.5% as 12.5)
What will be an ideal response? Clarify Question · What is the key concept addressed by the question? · What type of thinking is required? · What key words does the question contain? Gather Content · What do you already know about X-linked and autosomal inheritance? Consider Possibilities · What other information is related to the question? Which information is most useful? Choose Answer · Given what you now know, what information and/or problem solving approach is most likely to produce the correct answer? Reflect on Process · Did your problem-solving process lead you to the correct answer? If not, where did the process break down or lead you astray? How can you revise your approach to produce a more desirable result?
Vibrio cholerae produces a toxin that destroys the intestinal epithelium. This leads to massive diarrhea; the diarrhea can kill the human via dehydration but helps the bacteria spread and colonize other humans. What is this relationship?
A. Mutualistic B. Commensalistic C. Symbiotic D. Atavistic Clarify Question · What is the key concept addressed by the question? · What type of thinking is required? Gather Content · What do you already know about symbioses? How does it relate to the question? · What other information is related to the question? Which information is most useful? Choose Answer · Given what you now know, what information and/or problem solving approach is most likely to produce the correct answer? Reflect on Process · Did your problem-solving process lead you to the correct answer? If not, where did the process break down or lead you astray? How can you revise your approach to produce a more desirable result?
People who have a single X chromosome are female, while those with XXY sex chromosomes are males. In order to be a female, a human
A. cannot have an X chromosome. B. must have only one X chromosome. C. must have two X chromosomes. D. cannot have a Y chromosome. E. must have only one Y chromosome.
The existence of a separate set of enzymes and DNA molecules in mitochondria and chloroplasts
provide support for serial endosymbiosis. __________________Indicate whether the statement is true or false.