What could the lengths of the branches on the x-axis represent? (choose all that apply, no partial credit) Choice 1 of 4:Time Choice 2 of 4:Size of species Choice 3 of 4:number of genetic change Choice 4 of 4:number of species

Which of the following observations would provide the strongest evidence that two plants belong to different biological species? *   here are variations in their RNA sequences.       The leaves and flowers show morphological differences.       They produce viable but sterile offspring.       They occupy unique habitats in an ecosystem.

what is alternation of generations and could it be a good evolutionary strategy for some organisms

Which of the following models, that attempt to explain human origins and dispersal, no longer is supported due to current information supplied by genetic evidence?  In other words, which model has been thrown out while the other two are still being debated? Group of answer choices multiregional model partial replacement model complete replacement model

What does the biological species concept use as the primary criterion for determining the boundaries between species?   Question 3 options:   Geographic isolation   Niche differences   Gene flow   Molecular (e.g. DNA, RNA, protein) similarities   Morphological similarities

True or False: a species that exhibits stasis lacks variation and is unchanging. Explain your answer

The biological species concept depends on the existence of barriers to reproduction. What are they? Does this species concept apply in all situations?  Think of an example from nature where the biological species concept would NOT be that applicable.  Which species concept would be better in this example?   How does speciation occur? What environmental factors might contribute to speciation? Can an individual speciate? Use terminology for the two kinds of speciation we have learned about. What is “gene flow”? What does it mean if there is NO gene flow? Two groups of individuals are separated by either side of a canyon. One researcher found that they do not cross the canyon at any point. The group on the north side have fluffy tails and thicker coats, and they do not eat moss. The south side individuals eat moss almost exclusively, have a thin coat and tail, but otherwise are generally identical. When in the lab they mated successfully, and the offspring of that mating also mated…

Use the following tree to answer the question below. A в с B C DEF G Which of the following trees, if any, depicts the same relationship among species as shown above? G F E D CB A A BCD E F F GE D C

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Pick all that are true  If a bacterium with a gene that gives resistance to the antibiotic ampicillin is placed into medium without ampicillin, it may: Lose the gene because it is expensive to maintain if not giving a fitness advantage   Pass the gene to another bacterium via horizontal gene transfer   Take on viral metabolic genes   Begin the drift process to gain fitness   Pass the gene to its progeny cells   Lose the gene because there is no selection for ampicillin resistance