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Anole Lizards

This topic has 4 member replies
joyseychow Master | Next Rank: 500 Posts Default Avatar
Joined
15 Dec 2008
Posted:
125 messages

Anole Lizards

Post Wed Aug 12, 2009 1:56 am
Elapsed Time: 00:00
  • Lap #[LAPCOUNT] ([LAPTIME])
    Anole Lizard Species that
    occur together (sympatrically)
    on certain Caribbean islands
    Line occupy different habitats:
    (5) some live only in the grass,
    some only on tree trunks, and
    some only on twigs. These
    species also differ morpho-
    logically: grass dwellers are
    (10) slender with long tails, tree
    dwellers are stocky with long
    legs, twig dwellers are slender
    but stubby-legged. What is
    striking about these lizards
    (15) is not that coexisting species
    differ in morphology and habi-
    tat use (such differences are
    common among closely related
    sympatric species), but that
    (20) the same three types of habi-
    tat specialists occur on each
    of four islands: Puerto Rico,
    Cuba, Hispaniola, and Jamaica.
    Moreover, the Puerto Rican
    (25) twig species closely resembles
    the twig species of Cuba,
    Hispaniola, and Jamaica in
    morphology, habitat use, and
    behavior. Likewise, the spe-
    (30) cialists for other habitats are
    similar across the islands.
    The presence of similar
    species on different islands
    could be variously explained.
    (35) An ancestral species might
    have adapted to exploit a
    particular ecological niche on
    one island and then traveled
    over water to colonize other
    (40) islands. Or this ancestral
    species might have evolved
    at a time when the islands
    were connected, which some
    of these islands may once
    (45) have been. After the islands
    separated, the isolated lizard
    populations would have become
    distinct species while also
    retaining their ancestors' niche
    (50) adaptations. Both of these
    scenarios imply that speciali-
    zation to each niche occurred
    only once. Alternatively, each
    specialist could have arisen
    (55) independently on each of the
    islands.
    If each type of specialist
    evolved just once, then similar
    specialists on different islands
    (60) would be closely related.
    Conversely, if the specialists
    evolved independently on each
    island, then a specialist on one
    island would be more closely
    (65) related to other types of anoles
    on the same island-regardless
    of their ecological niches-
    than it would be to a similar
    specialist on a different island.
    (70) Biologists can infer how
    species are related evolu-
    tionarily by comparing DNA
    sequences for the same genes
    in different species. Species
    (75) with similar DNA sequences
    for these genes are generally
    more closely related to each
    other than to species with less-
    similar DNA sequences. DNA
    (80) evidence concerning the anoles
    led researchers to conclude
    that habitat specialists on one
    island are not closely related
    to the same habitat specialists
    (85) elsewhere, indicating that spe-
    cialists evolved independently
    on each island.


    Q. According to the passage, sympatric anole lizard species resemble many other closely related sympatric species in that the anole lizard species

    A) differ from one another in morphology and habitat use

    B) evolved on islands that were once connected

    C) appear to have adapted unusually quickly to new habitats

    D) have been able to colonize areas remote from their ancestral habitat

    E) occupy the same range of habitats in a number of different locations

    OA is A, Pls explain. Thks

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    Post Wed Aug 12, 2009 7:17 am
    joyseychow wrote:
    Anole Lizard Species that
    occur together (sympatrically)
    on certain Caribbean islands
    Line occupy different habitats:

    (5) some live only in the grass,
    some only on tree trunks, and
    some only on twigs. These
    species also differ morpho-
    logically
    : grass dwellers are
    (10) slender with long tails, tree
    dwellers are stocky with long
    legs, twig dwellers are slender
    but stubby-legged. What is
    striking about these lizards
    (15) is not that coexisting species
    differ in morphology and habi-
    tat use
    (such differences are
    common among closely related
    sympatric species
    ), but that
    (20) the same three types of habi-
    tat specialists occur on each
    of four islands: Puerto Rico,
    Cuba, Hispaniola, and Jamaica.
    Moreover, the Puerto Rican
    (25) twig species closely resembles
    the twig species of Cuba,
    Hispaniola, and Jamaica in
    morphology, habitat use, and
    behavior. Likewise, the spe-
    (30) cialists for other habitats are
    similar across the islands.
    The presence of similar
    species on different islands
    could be variously explained.
    (35) An ancestral species might
    have adapted to exploit a
    particular ecological niche on
    one island and then traveled
    over water to colonize other
    (40) islands. Or this ancestral
    species might have evolved
    at a time when the islands
    were connected, which some
    of these islands may once
    (45) have been. After the islands
    separated, the isolated lizard
    populations would have become
    distinct species while also
    retaining their ancestors' niche
    (50) adaptations. Both of these
    scenarios imply that speciali-
    zation to each niche occurred
    only once. Alternatively, each
    specialist could have arisen
    (55) independently on each of the
    islands.
    If each type of specialist
    evolved just once, then similar
    specialists on different islands
    (60) would be closely related.
    Conversely, if the specialists
    evolved independently on each
    island, then a specialist on one
    island would be more closely
    (65) related to other types of anoles
    on the same island-regardless
    of their ecological niches-
    than it would be to a similar
    specialist on a different island.
    (70) Biologists can infer how
    species are related evolu-
    tionarily by comparing DNA
    sequences for the same genes
    in different species. Species
    (75) with similar DNA sequences
    for these genes are generally
    more closely related to each
    other than to species with less-
    similar DNA sequences. DNA
    (80) evidence concerning the anoles
    led researchers to conclude
    that habitat specialists on one
    island are not closely related
    to the same habitat specialists
    (85) elsewhere, indicating that spe-
    cialists evolved independently
    on each island.


    Q. According to the passage, sympatric anole lizard species resemble many other closely related sympatric species in that the anole lizard species

    A) differ from one another in morphology and habitat use refer to the bold part in the passage above.. it states clearly that morphology and habitat differences are common among anole and other lizard species..
    what is unique among the anole lizard species is that "the same three types of habitat specialists occur on each of four islands" as mentioned in line 20..


    B) evolved on islands that were once connected

    C) appear to have adapted unusually quickly to new habitats

    D) have been able to colonize areas remote from their ancestral habitat

    E) occupy the same range of habitats in a number of different locations

    OA is A, Pls explain. Thks

    Thanked by: luisa
    joyseychow Master | Next Rank: 500 Posts Default Avatar
    Joined
    15 Dec 2008
    Posted:
    125 messages
    Post Wed Aug 12, 2009 8:23 pm
    Ketkoag, thks for pointing out.

    TheGraduate Senior | Next Rank: 100 Posts Default Avatar
    Joined
    02 Oct 2016
    Posted:
    77 messages
    Thanked:
    1 times
    Post Sun Nov 27, 2016 11:25 pm
    Quote:
    Q. According to the passage, sympatric anole lizard species resemble many other closely related sympatric species in that the anole lizard species

    A) differ from one another in morphology and habitat use refer to the bold part in the passage above.. it states clearly that morphology and habitat differences are common among anole and other lizard species..
    what is unique among the anole lizard species is that "the same three types of habitat specialists occur on each of four islands" as mentioned in line 20..
    Still cannot grasp the idea. The question asks about related sympatric species. Choice A speaks of differing morphology.

    The passage is from GMATPrep. But is the question also from GMATPrep? Could anyone find out?

    Secondly, I have another question from the same passage.

    Q. It can be inferred that the DNA evidence mentioned in the highlighted text supports which of the following statements about the twig-dwelling anole lizards of any one of the four Caribbean islands mentioned in the passage.

    A) They evolved from an ancestral species of twig dwellers at a time when their island was connected with the other three islands.
    B) They were once more similar morphologically to twig dwellers on the other three islands than they are at present.
    C) They are more closely related to tree and grass dwelling anoles on their island than they are to twig dwellers on the other three islands.
    D) Their habitat specialization as twig dwellers was influenced by the differences in the types of vegetation on the other three islands.
    E) Their DNA more closely resembles that of non-anole lizard species on their island that it does the DNA of anoles on the other three islands.

    Marty Murray Legendary Member
    Joined
    03 Feb 2014
    Posted:
    2037 messages
    Followed by:
    129 members
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    946 times
    GMAT Score:
    800
    Post Mon Nov 28, 2016 4:53 am
    TheGraduate wrote:
    Quote:
    Q. According to the passage, sympatric anole lizard species resemble many other closely related sympatric species in that the anole lizard species

    A) differ from one another in morphology and habitat use refer to the bold part in the passage above.. it states clearly that morphology and habitat differences are common among anole and other lizard species..
    what is unique among the anole lizard species is that "the same three types of habitat specialists occur on each of four islands" as mentioned in line 20..
    Still cannot grasp the idea. The question asks about related sympatric species. Choice A speaks of differing morphology.
    As you can tell by reading the passage, "closely related sympatric species" means "similar species that live together in the same geographic area."

    The three types of anole lizards are therefore closely related sympatric species.

    The passage goes on to say "What is striking about these lizards is not that coexisting species differ in morphology and habitat use (such differences are common among closely related sympatric species)".

    Do you now see why the answer is correct?

    Quote:
    Secondly, I have another question from the same passage.

    Q. It can be inferred that the DNA evidence mentioned in the highlighted text supports which of the following statements about the twig-dwelling anole lizards of any one of the four Caribbean islands mentioned in the passage.

    A) They evolved from an ancestral species of twig dwellers at a time when their island was connected with the other three islands.
    B) They were once more similar morphologically to twig dwellers on the other three islands than they are at present.
    C) They are more closely related to tree and grass dwelling anoles on their island than they are to twig dwellers on the other three islands.
    D) Their habitat specialization as twig dwellers was influenced by the differences in the types of vegetation on the other three islands.
    E) Their DNA more closely resembles that of non-anole lizard species on their island that it does the DNA of anoles on the other three islands.
    The OA to this question is C.

    None of the other answer choices are at all supported by the passage. for instance there is no reason at all to think that D is correct, as nothing in the passage indicates that anything on one island influenced the development of species on another island.

    The passage supports one aspect of C, the idea that the twig dwelling anole lizards on one island are not closely related to the lizards on the other islands by saying "DNA evidence concerning the anoles led researchers to conclude that habitat specialists on one island are not closely related to the same habitat specialists elsewhere".

    Then, to support the other aspect of C, that the twig dwelling anole lizards are related to the other types of anole lizards on the same island, you have to find in the second to last paragraph the following, "if the specialists evolved independently on each island, then a specialist on one island would be more closely related to other types of anoles on the same island regardless of their ecological niches than it would be to a similar specialist on a different island."

    Quote:
    The passage is from GMATPrep. But is the question also from GMATPrep? Could anyone find out?
    One GMAT Prep RC passage can be followed by various different sets of questions. So the fact that these questions do not appear in a certain set posted online does not indicate that they are not actual GMAT Prep questions. Further, the subtlety and tight construction of these questions tends to indicate that they are in fact official questions.

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    Thanked by: TheGraduate, gocoder

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