Which of the following statements is an accurate interpretation of the labeled branch points on the model? Location 1 represents the common ancestor of only two of the three species. Answer A: Location 1 represents the common ancestor of only two of the three species. A Locations 1 and 2 represent extinction events for G. humeralis. Answer B: Locations 1 and 2 represent extinction events for G. humeralis . B Location 3 represents the common ancestor of both G. humeralis and G. concinnatus. Answer C: Location 3 represents the common ancestor of both G. humeralis and G. concinnatus . C Locations 2 and 3 represent speciation events.
Gene Flow
Gene flow, also known as gene migration, is the introduction of genetic material from a particular population to another population of the same species through interbreeding. For example, a bee facilitates its reproductive process by carrying pollen from one flower to another. The flow alters the composition of the gene pool of the receiving population. It introduces new alleles within the population and helps increase variability. This exchange of genetic material occurs through reproduction and brings about new combinations of traits into the population. Where human beings are concerned, actual migration of populations, whether voluntary or forced, brings about gene flow.
Population Biology
Population biology is the study of patterns in organism populations, specifically the growth and management of population size, population genetics, the evolution of life history, species interactions, and demography.
Speciation
The process of speciation involves the formation of new species during evolution. The new species evolve in such a way that both new and old species are not able to interbreed. Thus, speciation occurs when few members of one species get separated from the main species due to geographical, mechanical, or reproductive isolation. These separated members develop new traits that make them different from the main species. In other words, speciation could be defined as the absence of gene flow between two populations that become new species.
Allele Fixation
A gene is a unit of heredity and contains both physical and functional information that shapes an individual. Genes are made up of DNA (deoxyribonucleic acid), which carry genetic information from one generation to another, from one set of parents to their offspring, and so on. Every cell in a human body, or any living organism, has the same DNA, which implies that every cell in an individual’s body has all the information it needs to build and sustain the body!
Which of the following statements is an accurate interpretation of the labeled branch points on the model?
-
Location 1 represents the common ancestor of only two of the three species.
Answer A: Location 1 represents the common ancestor of only two of the three species.A -
Locations 1 and 2 represent extinction events for G. humeralis.
Answer B: Locations 1 and 2 represent extinction events for G. humeralis .B -
Location 3 represents the common ancestor of both G. humeralis and G. concinnatus.
Answer C: Location 3 represents the common ancestor of both G. humeralis and G. concinnatus .C -
Locations 2 and 3 represent
speciation events.
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The presence of tiny hairs, called setae, on the toe pads of some geckos is associated with the ability to adhere to smooth surfaces. This ability allows
geckos to climb in areas where many predators cannot. Scientists studying the evolution of setae have identified three closely related species of gecko, only
one of which can adhere to smooth surfaces. A model of the evolutionary relatedness between these species is represented in the figure.
G. humeralis
1
Can adhere
2
G. concinnatus
O Cannot adhere
3
O G. antillensis
Submit
Which of the following statements is an accurate interpretation of the labeled branch points on the model?
A
Location 1 represents the common ancestor of only two of the three species.
В
Locations 1 and 2 represent extinction events for G. humeralis.
C
Location 3 represents the common ancestor of both G. humeralis and G. concinnatus.
Locations 2 and 3 represent speciation events.
MAY
CC
10
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