Evolution Test - 7

Evolution for Darwin was gradual while deVries believed mutation caused speciation. The single large mutation is called saltation.

Microspheres are molecules developed during organic evolution. They do not have all properties of life. They are composed of protein molecule and form buds to develop smaller microspheres.

Gene ratio remains constant in species having random mating. Gene flow, mutation and sexual selection are the factors that change the gene ratio of the population.

The geographical region Palarctic and Oriental are separated by high mountain ranges. The geographical separation do not allow the gene flow as mating is not possible between member of species.

Genetic drift and change due to natural selection are different as genetic drift does not involve completion between the members of a species but in natural selection there is completion between members.

The age of rock is calculated on the basis of number of strata present.Contained within the rock strata is evidence that the region was intensely dry 15,000 years ago. Having more number of strata means older the rock.

Natural selection is the survival of members of species having some new traits that may help the organism in given surrounding. Sexual selection is a kind of natural selection as mating between similar organisms only leads to reproduction.

Natural selection is a process in which heritable variations enabling better survival are enabled to reproduce and leave greater number of progeny in the habitat to increase in number faster than other species.

Variation due to mutation or variation due to recombination during gametogenesis results in changed frequency of genes and alleles in future generation which results into stabilization and directional change in which more individual acquire mean character value.

The Hardy–Weinberg principle, also known as the Hardy–Weinberg equilibrium, model, theorem, or law, states that allele and genotype frequencies in a population will remain constant from generation to generation in the absence of other evolutionary influences.

These influences include mutation, selection, genetic drift, gene migration, gene flow, genetic recombination and meiotic drive.