Assume you are an evolutionary biologist who is using coat coloration in several closely related species to reconstruct their evolutionary history

If you find that the coat color trait is symplesiomorphic, what can you do to resolve the species' evolutionary relationships?

What will be an ideal response?


ANS:
Will vary, but should include: using additional (or alternate) traits that are likely to be synapomorphic rather than symplesiomorphic; use a thorough knowledge of natural history of the organisms to select characters more likely to change slowly rather than rapidly over evolutionary time; use a large number of charac-ters—expecting synapomorphies to outweigh homoplasies or symplesiomorphies accidentally included in the set; include multiple outgroups to better estimate the polarity of the groups used.

Biology & Microbiology

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Describe the pathogenesis of HIV to explain how the number of CD4 lymphocytes decline in an ongoing HIV infection

What will be an ideal response?

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A fire devastates all trees in a wide swath of forest. Populations of a species of tree-dwelling frog on either side of the burned area diverge to become separate species. This is an example of _____

Fill in the blank(s) with correct word

Biology & Microbiology

The designation of YyWw for a heterozygous pea plant is the plant's ________

Fill in the blank with correct word.

Biology & Microbiology

Glucose is converted into glucose 6-phosphate by hexokinase. Glucose 6-phosphate then serves as the substrate for the enzyme phosphoglucose isomerase, which converts this reactant into fructose 6-phosphate. Fructose 6-phosphate serves as the substrate for phosphofructokinase, which converts fructose 6-phosphate into fructose 1,6-bisphosphate. Based on the information provided, this is an example of

A. enzyme inhibition. B. a metabolic pathway. C. allosteric regulation. D. feedback inhibition.

Biology & Microbiology