Table of Contents
- 1 How do two different species most likely evolve from one ancestral species?
- 2 How can two species develop from one species?
- 3 What could result in two populations of the same species developing different traits over many generations?
- 4 What are the two broad processes that make evolution possible?
- 5 When can it be said that two species possess different ancestor?
- 6 How can a species be distinguished from other species?
- 7 What is not suitable for the habitat between the two populations?
How do two different species most likely evolve from one ancestral species?
In allopatric speciation, organisms of an ancestral species evolve into two or more descendant species after a period of physical separation caused by a geographic barrier, such as a mountain range, rockslide, or river. Sometimes barriers, such as a lava flow, split populations by changing the landscape.
How can two species develop from one species?
Speciation is the process by which one species evolves to form two or more new species. Often members of different species are unable to interbreed due to the evolution of reproductive isolating barriers.
How do species evolve from a common ancestor?
Repeated branching events, in which new species split off from a common ancestor, produce a multi-level “tree” that links all living organisms. Darwin referred to this process, in which groups of organisms change in their heritable traits over generations, as “descent with modification.” Today, we call it evolution.
Can two different species have more than one common ancestor?
Common descent is an effect of speciation, in which multiple species derive from a single ancestral population. The more recent the ancestral population two species have in common, the more closely are they related.
What could result in two populations of the same species developing different traits over many generations?
Genetic variation within a species can result from a few different sources. Mutations, the changes in the sequences of genes in DNA, are one source of genetic variation. Another source is gene flow, or the movement of genes between different groups of organisms.
What are the two broad processes that make evolution possible?
The fundamental event in evolution is a change in the frequency of an allele (alternate gene form) in a population. If different alleles differ in their effects on fitness, both genetic drift and natural selection operate simultaneously. Two consequences of evolution are speciation and the development of adaptations.
What differentiates one species from another?
Most evolutionary biologists distinguish one species from another based on reproductivity: members of different species either won’t or can’t mate with one another, or, if they do, the resulting offspring are often sterile, unviable, or suffer some other sort of reduced fitness.
Is there one common ancestor?
This venerable ancestor was a single-cell, bacterium-like organism. But it has a grand name, or at least an acronym. It is known as Luca, the Last Universal Common Ancestor, and is estimated to have lived some four billion years ago, when Earth was a mere 560 million years old.
When can it be said that two species possess different ancestor?
If two or more species share a unique physical trait they may all have inherited this trait from a common ancestor. Traits that are shared due to common ancestry are homologous structures.
How can a species be distinguished from other species?
A) A species can be distinguished by body shape and other structural features. B) Members have the potential to interbreed in nature and produce viable, fertile offspring. C) A species is described in terms of its interaction with living and non-living environment.
Why don’t birds from two different populations breed together?
The habitat between the populations is not suitable for these birds. When birds from the two populations are brought together, they produce young whose appearance is intermediate between the two parents.
Does natural selection affect the frequency of two different species?
A) Yes; natural selection has affected the frequency of the two different forms. B) Yes; they have completely different coloration. C) Yes; they are reproductively isolated based on habitat. D) No; they still can interbreed. D Which statement describes unity within a species?
What is not suitable for the habitat between the two populations?
Use the following information to answer the question. Two populations of birds with somewhat different coloration live on opposite sides of a peninsula. The habitat between the populations is not suitable for these birds.