The human population went through a genetic bottleneck around 70,000 years ago, resulting in a reduction of genetic diversity. Which evolutionary process played a significant role in shaping human genetic diversity during this event? Genetic drift Gene flow Sexual selection Natural selection

How can a shift in the proportion of genes in a population could lead to the evolution of a new species?  Explain why evolution happens to a whole population rather than to a single individual.

Which of the following forces of evolution is considered purely random? natural selection non-random mating genetic drift O mutation O migration

An allele that causes an altered form of hemoglobin occurs in all human populations. However in populations where malaria is a threat there is a relatively higher percentage of individuals with the allele. Individuals who have one allele for this condition have an increased resistance to malaria. Individuals with two alleles for this condition have significant medical problems and die young. This allele has been found in high numbers in certain populations in West Africa, Southeast Asia and Greece. What process of evolution likely led to the appearance of this allele? A-mutation B-genetic drift C-natural selection D-gene flow   Refer to the previous example (#2): What process of evolution likely led to this allele being in higher numbers in some populations? A-mutation B-natural selection C-genetic drift D-gene flow

natural selection is incorrect

Origins of Modern Humans Current data suggest that modern humans evolved from archaic humans primarily in East Africa. A 195,000 year old fossil from the Omo 1 site in Ethiopia shows the beginnings of the skull changes that we associate with modern people, including a rounded skull case and possibly a projecting chin. A 160,000 year old skull from the Herto site in the Middle Awash area of Ethiopia also seems to be at the early stages of this transition. It had the rounded skull case but retained the large brow ridges of archaic humans. Somewhat more advanced transitional forms have been found at Laetoli in Tanzania dating to about 120,000 years ago. By 115,000 years ago, early modern humans had expanded their range to South Africa and into Southwest Asia (Israel) shortly after 100,000 years ago. There is no reliable evidence of modern humans elsewhere in the Old World until 60,000-40,000 years ago, during a short temperate period in the midst of the last ice age.

The neutral theory of evolution proposed that most genetic mutations are functionally neutral or nearly neutral. Neutral mutations would be fixed in a population by: O the invariance of DNA O random genetic drift O balancing selection natural selection asexual reproduction

A common misconception about mutations is that they are always harmful. What is the reality of mutation effects on an organism? O Mutations can be harmful, neutral, or beneficial, and they drive genetic variation Mutations are always harmful and decrease genetic variation Mutations are always neutral and have no effect on genetic variation Mutations are always beneficial and increase genetic variation

Siberian tigers are the largest of all tiger species because only the largest individual are able to survive the cold harsh winters of north eastern Russia. what type Mechanism evolution is this Natural Selection Genetic drift Gene Flow Bottleneck Effect Founder Effect Sexual Selection

Which mechanism of evolutionary change corresponds to each of the following descriptions? Evoluntionary change: option (Match the following with the list) - Natural selection - Mutation - Genetic drift - Gene flow  --------------------------------------------------------------------------- • This mechanism is always adaptive. • This mechanism is the main source of new alleles in a species. • This mechanism occurs when individuals of the same species immigrate from one population to another. • This mechanism is non-adaptive and its effects are strongest in a small population.