Answer: Weathering and Erosion could make a cave if the force is high enough, and it would be in the physical element because chemical is not entirely correct.

7 0

3 years ago

Natural selection and genetic drift are two mechanisms of evolution that can lead to speciation. Define both natural selection a

timofeeve [1]

<h2>Evolution </h2>

Explanation:

Genetic drift

Genetic drift is change in allele frequencies in a population from generation to generation that occurs due to chance events
The genetic drift occurs due to random fluctuation of any allele in a gene pool and is more efficient in small population
The founder effect and the bottleneck effect are cases in which a small population is formed from a larger population which means they may experience strong drift for generations
In founder effect a genotype from a homogeneous gene pool migrate to a newer habitat and colonize there and form a newer community which leads to the genetic drift to the original population, speciation which occurs in this effect is the peripatric speciation
In bottleneck effect the elimination of inferior genotype from a homogeneous gene pool occurs due to the strong selection pressure and changing environmental conditions which leads to genetic drift and a only a few most adapted genotype survives and flourish

Natural Selection

Natural selection is a selection pressure which operates in a population and allow the best fitted genotype to survive in changing environmental conditions and eliminate the other genotype which are not fit
Genetic drift, mutation and sexual selection are important causes of natural selection
Directional natural selection favours the superior genotype and eliminate the inferior and intermediate genotype, in the history of evolution the most common natural selection is directional natural selection
Stabilizing natural selection favours the intermediate genotype but eliminates the extreme genotype
Bidirectional natural selection favours the extreme genotypes but eliminate the intermediate genotypes

5 0

3 years ago

During replication the strands of a double stranded dna molecule separate when the bonds are broken between their paired bases.

Feliz [49]

DNA undergoes semi conservative DNA replication in which a new Daughter strand is evolved from each parent DNA strand. Hence it is important that the parent DNA strand separate such that bases on the Daughter DNA can be complimentary to that of the parent strand it is coded from and same as that of the antiparallel parent DNA which is being separated. This ensures conservation and protection of the integrity of the genetic code

5 0

3 years ago