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प्रश्न
Give any ‘two’ factors responsible for genetic variation.
Explain any two causes of genetic variation.
उत्तर
Gene mutations, gene flow, genetic recombination, genetic drift, and chromosomal aberration are some factors or Causes responsible for genetic variation.
- Gene mutations: A sudden, permanent heritable change in DNA, such as a point mutation within a gene, leads to variations by altering the phenotype of an organism.
- Gene Flow: The movement of genes into or out of a population through migration, gametes, or DNA segments, which changes gene frequencies and contributes to genetic variation.
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संबंधित प्रश्न
Give two chromosomal similarities between man and apes.
Define the term gene flow.
Match the following:
| Column- I | Column- II |
| 1. August Weismann | a. Mutation theory |
| 2. Hugo de vries | b. Germplasm theory |
| 3. Charl Darwin | c. Theory of acquired characters |
| 4. Lamark | d. Theory of natural selection |
Long answer question.
Explain the different factors responsible for genetic variations.
Any random fluctuation in allele frequency, occurring in the natural population by pure chance is called __________.
The total genetic information encoded in sum total of genes in a Mendelian population is called ______.
Match the columns and choose the correct option.
| Column I | Column II | ||
| i. | Ecological isolation | a. | Sexually mature at different times of the year |
| ii. | Ethological isolation | b. | Specific mating behaviours |
| iii. | Mechanical isolation | c. | Difference in structure of mating organs |
| iv. | Seasonal isolation | d. | Same geographic region but separate habitat |
The change in gene and gene frequencies caused due to various aspects like mutation recombination and migration is called ______.
Domestic wheat, which has 42 chromosomes, is probably hexaploid (6n), whereas the haploid number in the ancestral ones was 7. Find out the right reason as to how are such plants produced?
Define the Transformation.
