Which one of the following statements about natural selection is not correct?
Natural selection can only occur if there is no variation amongst members of the same species.
Natural selection is Darwin's mechanism of evolution, and it fundamentally REQUIRES heritable variation among individuals of a species to operate — without variation, there is nothing for the environment to select for or against. The claim that natural selection "can only occur if there is no variation" reverses this requirement and is factually wrong.
Over time, favourable adaptations do increase in frequency because individuals carrying them survive and reproduce more successfully — a correct statement.
Overproduction of offspring beyond what resources can support (as noted by Malthus and used by Darwin) creates the struggle for existence that drives selection — a correct statement.
Mutation, meiosis (independent assortment and crossing over) and sexual reproduction (recombination) are indeed the sources of genetic variation in a population — a correct statement.
Hence, the answer is that natural selection requires no variation is not correct.
Similar Questions
Consider the following statements about genetic engineering :
1. The technique of genetic engineering involves creation of recombinant DNA, use of gene cloning and gene transfer.
2. Restriction enzymes cut DNA at specific locations.
3. Restriction enzymes split the entire double-stranded DNA into two strands.
Which of the statements given above is/are correct?
Which of the following is/are the basic step(s) in genetically modifying an organism?
1. Identification of DNA with desirable genes
2. Introduction of the identified DNA into the host
3. Maintenance of introduced DNA in the host and transfer of the DNA to its progeny
Select the correct answer using the code given below.
Consider the following stages of insulin production procedure through gene technology :
1. Isolation of insulin coding gene from humans
2. Inserting the insulin coding gene into a plasmid vector
3. Inserting the recombinant plasmid vector into the bacterium (E. coli)
Which of the following is a correct sequence of the above?
Important Questions from Genetics and Evolution
Different varieties of the same gene are called
In a sexually reproducing organism, which one of the following statements is appropriate both for the parent and offspring?
In most prokaryotes, the chromosome number is:
Bacterial DNA is referred to as naked because it is not associated with:
The two important features of sexual reproduction in higher organisms that create genetic diversity in offspring are
