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Flashcards: Making inferences based on the passage

Adapted from "Taking a Second Look: An Analysis of Genetic Markers in Species Relatedness" by Joseph Ritchie (2014)

Phylogenetics is the study of genetic composition in various species and is used by evolutionary biologists to investigate similarities in the molecular sequences of proteins in varying organisms. The amino acid sequences that build proteins are used to construct mathematical matrices that aid in determining evolutionary ties through the investigation of percentage similarities. The study of these matrices helps to expose evolutionary relationships between species that may not have the same overt characteristics.

Species adapt and evolve based on the pressures that exist in their environment. Climate, food source, and habitat availability are only a few factors that act on species adaptation. These stressors can alter the physical characteristics of organisms. This divergence in evolution has made it difficult to determine the interrelatedness of organisms by analyzing their physical characteristics alone.

For instance, looking only at physical characteristics, the ghost bat resembles a pigeon more than a spider monkey; however, phylogenetics has found that the amino acid sequences that construct the beta hemoglobin molecules of bats are twenty percent more similar to those of mammalian primates than those of birds. This helps reject the assumption that common physical characteristics between species are all that is needed to determine relatedness.

The differences produced by divergent evolution observed in the forest-dwelling, arboreal spider monkey and the nocturnal, airborne ghost bat can be reconciled through homology. Homologous characteristics are anatomical traits that are similar in two or more different species. For instance, the bone structure of a spider monkey’s wrist and fingers greatly resembles that of a bat’s wing or even a whale’s fin. These similarities are reinforced by phylogenetic evidence that supports the idea that physically dissimilar species can be evolutionarily related through anatomical and genetic similarities.

A scientist studied the relatedness of several reptilian species solely by investigating fossil evidence and has concluded that physical characteristics alone are enough to determine species relatedness. Would this scientist agree with the claims made by phylogenetic research?

No, because phylogenetics assumes that physical traits and characteristics are not the only objective and reliable markers in the study of species relatedness

Yes, because a great deal of research is based on physical comparisons

Yes, because phylogenetics is second to physical comparisons and thus supports the archaeologist's position

No, because phylogenetics is an unreliable and new technique that has yet to prove itself in major scientific arenas

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Flashcards: Making inferences based on the passage

Your answer:

Yes, because a great deal of research is based on physical comparisons

Your answer:

Yes, because phylogenetics is second to physical comparisons and thus supports the archaeologist's position

Your answer:

No, because phylogenetics is an unreliable and new technique that has yet to prove itself in major scientific arenas

Correct answer:

No, because phylogenetics assumes that physical traits and characteristics are not the only objective and reliable markers in the study of species relatedness

Explanation:

The scientist studied relatedness based on the fossil record of physical traits. He would not agree with the notion that phylogenetics may better explain relatedness via genetic factors. The rest of the choices are incorrect because they are not supported by the passage.

Flashcards: Making inferences based on the passage

Passage adapted from Pride and Prejudice by Jane Austen (1813)

"'If you will thank me,' he replied, 'let it be for yourself alone. That the wish of giving happiness to you might add force to the other inducements which led me on, I shall not attempt to deny. But your family owe me nothing. Much as I respect them, I believe I thought only of you.'"

Elizabeth was too much embarrassed to say a word. After a short pause, her companion added, 'you are too generous to trifle with me. If your feelings are still what they were last April, tell me so at once. My affections and wishes are unchanged; but one word from you will silence me on this subject for ever.'

Elizabeth, feeling all the more than common awkwardness and anxiety of his situation, now forced herself to speak; and immediately, though not very fluently, gave him to understand that her sentiments had undergone so material a change since the period to which he alluded, as to make her receive with gratitude and pleasure his present assurances. The happiness which this reply produced was such as he had probably never felt before, and he expressed himself on the occasion as sensibly and as warmly as a man violently in love can be supposed to do. Had Elizabeth been able to encounter his eyes, she might have seen how well the expression of heartfelt delight diffused over his face became him; but, though she could not look, she could listen, and he told her of feelings which, in proving of what importance she was to him, made his affection every moment more valuable.

They walked on, without knowing in what direction. There was too much to be thought, and felt, and said, for attention to any other objects. ..."

From the above passage, we can infer that _________________.

the couple will soon break up

the first speaker wants Elizabeth for her money

Elizabeth is unhappy with how things have turned out

the couple will be married

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Flashcards: Making inferences based on the passage

From the above passage, we can infer that _________________.

Your answer:

the couple will soon break up

Your answer:

the first speaker wants Elizabeth for her money

Your answer:

Elizabeth is unhappy with how things have turned out

Correct answer:

the couple will be married

Explanation:

Everything in the final two paragraphs indicates that the two characters are in love and delighted with each other. In this state, it is reasonable to expect that they will soon be married.

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Flashcards: Making inferences based on the passage

Flashcards: Making inferences based on the passage

Flashcards: Making inferences based on the passage

Flashcards: Making inferences based on the passage

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Flashcards: Making inferences based on the passage

Flashcards: Making inferences based on the passage

Flashcards: Making inferences based on the passage

Flashcards: Making inferences based on the passage

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