The Northern leopard frog (Rana pipiens) and Southern leopard frog (Rana utricularia) are morphologically similar, but they do not mate. They sound very different when calling for a mate. Which mechanism may explain why these frogs are listed as separate species?
A. the inability to interbreed because of morphological differences.
B. the difference in bone structure and skin color of the organisms.
C. DNA sequences of particular genes.
D. the habitat of the organisms.
E. both the DNA sequences of particular genes and the inability to produce viable offspring.
E. both the DNA sequences of particular genes and the inability to produce viable offspring.
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Meerkats are small desert mammals that live in groups of 20–50 animals. You observe the behavior of a group of meerkats. Which of the following behaviors would you categorize as examples of reciprocal altruism?
A. Two meerkats take turns grooming each other, each spending about the same amount of time grooming the other. B. One meerkat grooms a second meerkat, who is sleeping. C. One meerkat spends time standing upright on a stump, looking around, while other meerkats forage for food. D. One meerkat spends time sleeping in the burrow after eating, while other meerkats forage for food. E. One meerkat stands in the sun, while the other spends time digging out the burrow.
In an XY individual, a mutation in an X-linked gene called the androgen receptor results in androgen insensitivity and _____
1.Klinefelter syndrome 2.female phenotype 3.pseudohermaphroditism 4.Turner syndrome 5.X chromosome inactivation
The stage during which chromosomes shorten by condensing their nucleoprotein is called
A. anaphase. B. metaphase. C. prophase. D. telophase.
Rubella vaccine is a(n) (attenuated/inactivated/subunit) vaccine and should not be given to pregnant women
What will be an ideal response?