Genetic drift operates in which of the following population?
Genetic drift is defined as the variation in the relative frequency of different genotypes in a small population, owing to the chance disappearance of particular genes as individuals die or do not reproduce.
Genetic drift occurs in small populations because the reason is occasional occurrences of alleles getting lost with higher probability. If and when this loss of alleles starts then the genetic drift continues until that specific allele is totally lost in the entire population.
Hence Genetic drift operates in a small isolated population.
So, the correct answer is 'Small isolated population'.
Which of the following statements, support the view that elaborate sexual reproductive process appeared much later in the organic evolution? (i) Lower groups of organisms have simpler body design. (ii) Asexual reproduction is common in lower groups. (iii) Asexual reproduction is common in higher groups of organisms. (iv) The high incidence of sexual reproduction in angiosperms and vertebrates.
Given below are four statements (A - D) each with one or two blanks. Select the option which correctly fills up the blanks in two statements. (A) Wings of butterfly and birds look alike and are the results of __(i)__ evolution. (B) Miller showed that $$CH_{4}, H_{2}, NH_{3}$$ and __(i)__ when exposed to electric discharge in a flask resulted in formation of __(ii)__. (C) Vermiform appendix is a __(i)__ organ and an __(ii)__ evidence of evolution. (D) According to Darwin evolution took place due to __(i)__ and __(ii)__ of the fittest.
Which of the following statements is correct?
Evolution of life shows that life forms had a trend of moving from _________________.
What forms the basis for evolutionary processes?
Evolution of life shows that life forms had a trend of moving from _________________.