A biologist studied a population of squirrels for 15 years. During that time, the population was never fewer than 30 squirrels and never more than 45. Her data showed that over half of the squirrels born did not survive to reproduce, because of competition for food and predation. In a single generation, 90% of the squirrels that were born lived to reproduce, and the population increased to 80. Which inference(s) about this population might be true?

A) The amount of available food may have increased.

B) The number of predators may have decreased.

C) The squirrels of subsequent generations should show greater levels of genetic variation than previous generations, because squirrels that would not have survived in the past will now survive.

Choose correct combination,

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#Question id: 5206

#Unit 11. Evolution and Behavior

A microarray known as a GeneChip, with most now known human protein coding sequences, has recently been developed to aid in the study of human cancer by first comparing twothree subsets of cancer subtypes. What kind of information might be gleaned from this GeneChip to aid in cancer prevention?

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#Question id: 5207

#Unit 11. Evolution and Behavior

Why is it unwise to try to relate an organismʹs complexity with its size or number of cells?

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#Question id: 5208

#Unit 11. Evolution and Behavior

Fragments of DNA have been extracted from the remnants of extinct wooly mammoths, amplified, and sequenced. These can now be used to

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#Question id: 5209

#Unit 11. Evolution and Behavior

If humans have 2,900 Mb, a specific member of the lily family has 120,000 Mb, and a yeast has ~13 Mb, why canʹt this data allow us to order their evolutionary significance

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#Question id: 5210

#Unit 11. Evolution and Behavior

Which of the following is a representation of gene density?

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#Question id: 5211

#Unit 11. Evolution and Behavior

Why might the cricket genome have 11 times as many base pairs than that of Drosophila melanogaster?