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m_a_m_a [10]
2 years ago
9

What are the defining characteristics of amphibians?

Biology
2 answers:
Bezzdna [24]2 years ago
8 0

Amphibians represent a group of vertebrates that require water to survive.

<h3>Amphibians</h3>

They are one of the major divisions of vertebrates along with fishes, birds, and mammals.

In addition to possessing the basic features of vertebrates, amphibians have the following characteristics:

  • They are cold-blooded
  • They can breathe through their skin as well as using lungs
  • They need water for survival
  • Reproduction is by laying eggs that are fertilized externally
  • They are mostly carnivorous

More on amphibians can be found here: brainly.com/question/13744586

#SPJ9

Oduvanchick [21]2 years ago
4 0

  • Amphibians are vertebrates.
  • Their skin is smooth and slimy.
  • Amphibians breathe through their skin, as well as their lungs in some cases.
  • Amphibians are cold-blooded.
  • They have a complex life cycle (larval and adult stages).
  • Many species of amphibians vocalize.
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Man encourages his sister to see a genetic counselor in order to find out that she has the genetic disease or not.

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Probability = ½

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The options

a. New combinations of genes yielding genotypes of greater fitness

b. Few heterozygotes because of underdominance

c. Frequency-dependent selection, leading to fluctuations in fitness

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The CORRECT ANSWER IS b.

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Explanation:

In genetics, underdominance (at times called "negative overdominance") is the opposite of overdominance.

It is the selection against the heterozygote, that leads to disruptive selection and divergent genotypes. It occurs in cases of inferior and reduced fitness (As in our case study, it is the different chromosomal fusions and inversions)

of the heterozygotic genotype to the dominant or recessive homozygotic genotype. It is unstable as it causes fixation of either allele.

Another example is the African butterfly species Pseudacraea eurytus, which makes use of Batesian mimicry to avoid predation. This species carries two alleles that gives a coloration that is alike to a different local butterfly species that is harmful to its predator. The butterflies who are heterozygous for this trait are observed to be intermediate in coloration and thus encounter an higher risk of predation and a decrease in the total fitness.

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