This diagram illustrates the results of Meselson and Stahl’s experiments with E. coli, in which they were able to demonstrate that DNA replicates according to the semi-conservative model. If DNA replication had proven to follow the dispersive model instead, how would the results of this experiment differed?
a. Equal amounts of 15N and 14N would persist through all generations.
b. The DNA containing 15N would be eliminated in the third generation.
c. More than three bands would be created during the experiment.
d. No measurable sorting of DNA would have occurred after centrifuging.
c. More than three bands would be created during the experiment.
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. In fruit flies (Drosophila melanogaster) there is a dominant allele for red eyes and a recessive allele for white eyes. These alleles are located on the X chromosome. If a heterozygous red-eyed female is mated with a white-eyed male, what percentage of the offspring are expected to be white-eyed females? ( 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 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?
You are genetic counselor, and a couple comes to you with concerns that if they have a child together
it could have cystic fibrosis. Genetic tests reveal that the woman is a carrier for cystic fibrosis but the man is not. Which of the following would be a correct thing to tell them?
a. Any child that they produce has a 50% chance of having cystic fibrosis, and the rest will be carriers. b. All of their offspring will have cystic fibrosis. c. They should not have any concerns, as no child that they produce should wind up with cystic fibrosis. d. No child that they produce should wind up with cystic fibrosis, but each of their offspring will have a 50% chance of being a carrier. e. Any child that they produce will have a 25% chance of having cystic fibrosis.
Reef-building polyps get their sugars from
mutualistic
a. green algae. b. cyanobacteria. c. dinoflagellates. d. euglenoids. e. planarians
Which is NOT a chromosomal aberration?
a. deletion b. extra chromosomes c. translocation (exchange of parts between nonhomologs) d. crossing over e. fewer chromosomes