1. A piece of DNA molecule that can serve as a carrier for the gene to be cloned is called as a
2. According to who amongthe following, "although the intermediate basis of the variations which make evolution possible is genetic segregation and recombination, its ultimate source is mutation"?
Answer & Solution
Answer: Option D
Solution:
The correct answer is Option D: Stebbins.This quote explains how living things change and evolve over long periods. Let's break it down:
1. Variations make evolution possible: Imagine a group of plants. Some might be taller, some shorter, some have different colored flowers. These differences are called variations. Evolution, which is the process of life changing over time, can only happen if there are these differences among individuals.
2. Intermediate basis: Genetic Segregation and Recombination: Think of it like shuffling a deck of cards. You're not creating new cards, but you're getting new combinations. Similarly, genetic segregation (when genes separate during reproduction) and recombination (when genes from parents mix to form new combinations in their offspring) create new mixes of existing genetic material. This is a very important way to create diversity, but it's like rearranging what's already there.
3. Ultimate source: Mutation: This is the key! While shuffling cards (recombination) creates new hands, what if a card itself suddenly changed, or a new card appeared in the deck? That's what a mutation is. A mutation is a sudden, permanent change in the genetic material (DNA). It's the only way to introduce truly *new* genetic information into a population. So, mutations are the ultimate source because they create the original raw material for variation, which can then be shuffled around by segregation and recombination.
Stebbins (G. Ledyard Stebbins) was a famous evolutionary biologist who was a key figure in developing the "Modern Synthesis" of evolution. This theory combined Charles Darwin's ideas of natural selection with Gregor Mendel's genetics and the understanding of mutations. His work emphasized the crucial role of mutation as the ultimate source of genetic variation upon which evolution acts.
So, in simple terms: Mutations create new traits, and then those traits get mixed and matched through genetic segregation and recombination, allowing evolution to happen!
3. A haploid organism contains only one set of chromosomes, and is said to be
4. Which of the following is the correct pair?
5. Substitution of a purine by a purine, of a pyrimidine by a pyrimidine, and of a base-pair by another base-pair which retains the original orientation of the purines and pyrimidines belongs to the class known as
6. The kind and amount of fertilizers to be applied to the soil are determined considering which of the following points?
7. The gene producing chlorophyll deficiency in Lima bean (Phaseolus lunatus) exhibits
8. The first geological time scale was developed by
9. Consider the following statements regarding self-assembly and choose the correct answer:
1. Modern self-assembly theory holds that protobiogenesis occurred due to inherent property of chemical molecules of self organization
2. First clear cut demonstration of self-assembly was provided by Schmitt (1956)
3. The combination of proteins and nucleic acids, as in tobacco mosaic virus, is an example of intermacromolecular assembly
4. The modern researches of protobiogenesis by self-assembly challenge the central dogma of molecular biology suggested by Watson (1965)
1. Modern self-assembly theory holds that protobiogenesis occurred due to inherent property of chemical molecules of self organization
2. First clear cut demonstration of self-assembly was provided by Schmitt (1956)
3. The combination of proteins and nucleic acids, as in tobacco mosaic virus, is an example of intermacromolecular assembly
4. The modern researches of protobiogenesis by self-assembly challenge the central dogma of molecular biology suggested by Watson (1965)
10. When a part of one chromosome is joined to a part of different chromosome, the aberration is called
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