Tag: neo darwinism

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Questions Related to neo darwinism

Multiple choice zoology origin of life and organic evolution neo darwinism mechanism of evolution other theories of evolution

Reproductive isolation is _________.

  1. Inability to interbreed

  2. Ability to interbreed

  3. Breeding in isolation

  4. Intraspecific breeding
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Reproductive isolation refers to the mechanisms that prevent two different populations from interbreeding and producing fertile offspring, which is a key step in speciation.

Multiple choice zoology origin of life and organic evolution neo darwinism mechanism of evolution other theories of evolution

A group of interbreeding individuals reproductively isolated from others is,

  1. Biological species

  2. Morphospecies

  3. Linneon

  4. Evolutionary species
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation
Earnest Meyr gave most accepted biological concept of species which defines species as a group of actually or potentially interbreeding population that are reproductively isolated from other such groups.
So, the correct answer is 'Biological species'
Multiple choice zoology origin of life and organic evolution neo darwinism mechanism of evolution other theories of evolution

An example of reproductive isolation is

  1. Mule

  2. Bonellia

  3. Dinosaurs

  4. Archaeopteryx
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

  • Reproductive isolation refers to a set of mechanisms that prevent animals of the same group from breeding. These are reproductive barriers that do not allow the species to mate and produce offspring.
  • Mule is an example of low hybrid viability type of reproductive isolation.
  • Even though horses and donkeys can mate and produce healthy offspring, the offsprings thus produced termed mules cannot pass their genetic information down to future generations, so they are a genetic dead-end. There is no gene flow through infertile hybrids.
So, the correct option is 'Mule'.

Multiple choice zoology origin of life and organic evolution neo darwinism mechanism of evolution other theories of evolution

In which type of isolation, two species living in different habitats are prevented from interbreeding :

  1. Temporal

  2. Behavioural

  3. Ecological

  4. Genetic
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

  • Ecological isolation is a type of reproductive isolation in which mating is prevented because of the separation of species resulting from the difference in their habitat. 
  • This usually occurs when the species are used to different habitat types, or different parts of the same habitat. Even if the geographic range of two species overlaps, the difference in their ecological needs and breeding requirements is enough to isolate them from each other.
So, the correct answer is 'Ecological'

Multiple choice zoology origin of life and organic evolution neo darwinism mechanism of evolution other theories of evolution

Potential danger to population greatly reduced in number is :

  1. Hardy-Weinberg disequilibrium

  2. Reduced gene flow

  3. Tendency towards assortative mating

  4. Loss of genetic variability
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

  • Reductions in population size and absence of gene flow can lead to reductions in genetic variability, reproductive fitness, and a limited ability to adapt to environmental change increasing the risk of extinction. 
  • Island populations are typically small and isolated, and as a result, inbreeding and reduced genetic diversity elevate their extinction risk.
So, the correct answer is 'Loss of genetic variability'

Multiple choice zoology origin of life and organic evolution neo darwinism mechanism of evolution other theories of evolution

Human population grows exponentially while food production grows at an arithmetic rate, leading to over population and social problem. This is :

  1. Krenze theory of population

  2. Malthus theory of human population

  3. Krenze theory modified by Malthus

  4. Malthus theory modified by Darwin
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

  • The principle of Malthusian theory of human population states that human populations grow exponentially (i.e., doubling with each cycle) while food production grows at an arithmetic rate (i.e. by the repeated addition of a uniform increment in each uniform interval of time). 
  • This scenario of arithmetic food growth with simultaneous geometric human population growth predicted a future when humans would have no resources to survive on. To avoid such a catastrophe, Malthus urged controls on population growth.
So, the correct option is 'Malthus theory of human population'.

Multiple choice zoology origin of life and organic evolution neo darwinism mechanism of evolution other theories of evolution

Assertion : Miller used four gases - methane, oxygen, hydrogen and water vapour for formation of simple organic compounds.

Reason : He prepared some amino acids in his apparatus.

  1. If both the assertion and the reason are true and the reason is a correct explanation of the assertion

  2. If both the assertion and reason are true but the reason is not a correct explanation of the assertion

  3. If the assertion is true but the reason is false

  4. If both the assertion and reason are false

  5. If the assertion is false but reason is true
Reveal answer Fill a bubble to check yourself
E Correct answer
Explanation

Miller circulated four gases - methane, ammonia, hydrogen and water vapour in an air tight apparatus and passed electrical discharges from electrodes. He found a large number of simple organic compounds including some aminoacids such as alanine, glycine and aspartic acid.