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Evolution
... land masses, they remain diversified only on the isolated Australian continent, where they have evolved to fill the same ecological niches that placental mammals occupy elsewhere. The Tasmanian wolf, for example, closely resembles the doglike carnivores of other continents. More specialized parallel ...
... land masses, they remain diversified only on the isolated Australian continent, where they have evolved to fill the same ecological niches that placental mammals occupy elsewhere. The Tasmanian wolf, for example, closely resembles the doglike carnivores of other continents. More specialized parallel ...
Selection: an overview
... correlated with external biotic or abiotic features. However, Darwin himself soon recognized that natural selection alone can not explain sexually dimorphic features such as exaggerated sexual ornaments (e.g. peacock tail, antlers of deer) that obviously impair survival. In The Descent of Man, and S ...
... correlated with external biotic or abiotic features. However, Darwin himself soon recognized that natural selection alone can not explain sexually dimorphic features such as exaggerated sexual ornaments (e.g. peacock tail, antlers of deer) that obviously impair survival. In The Descent of Man, and S ...
What is Evolution?
... Darwin's Theory of Natural Selection is the presently accepted theory of evolution. However, Darwin's theory did not explain sources of genetic variation Variations within a species increase the chance of survival when conditions change. ...
... Darwin's Theory of Natural Selection is the presently accepted theory of evolution. However, Darwin's theory did not explain sources of genetic variation Variations within a species increase the chance of survival when conditions change. ...
Worksheet-version 2 for Exam I on Evolution
... these is more adaptive to the model? Give some examples of Mullerian mimicry. 100. How would an evolutionary biologist explain the evolution of the eye? 101. Natural selection takes _______________ variation produced by mutations, genetic recombination, and sexual reproduction and makes it _________ ...
... these is more adaptive to the model? Give some examples of Mullerian mimicry. 100. How would an evolutionary biologist explain the evolution of the eye? 101. Natural selection takes _______________ variation produced by mutations, genetic recombination, and sexual reproduction and makes it _________ ...
Chapter 13 and 14 Review
... of the H-W equation. p = frequency of the dominant allele (A) q = frequency of the recessive allele (a) q2 = frequency of homozygous recessive (aa) p2 = frequency of homozygous dominant (AA) ...
... of the H-W equation. p = frequency of the dominant allele (A) q = frequency of the recessive allele (a) q2 = frequency of homozygous recessive (aa) p2 = frequency of homozygous dominant (AA) ...
Chapter 13 and 14 Review
... of the H-W equation. p = frequency of the dominant allele (A) q = frequency of the recessive allele (a) q2 = frequency of homozygous recessive (aa) p2 = frequency of homozygous dominant (AA) ...
... of the H-W equation. p = frequency of the dominant allele (A) q = frequency of the recessive allele (a) q2 = frequency of homozygous recessive (aa) p2 = frequency of homozygous dominant (AA) ...
Evolution - NIU Department of Biological Sciences
... genetic disease that makes them less fit than AA or Aa individuals. In an extreme case, assume that the aa individuals die before they can reproduce. Their fitness is 0, since they can’t pass their genes on to future generations. • So, only the AA and Aa individuals mate. They still generate some aa ...
... genetic disease that makes them less fit than AA or Aa individuals. In an extreme case, assume that the aa individuals die before they can reproduce. Their fitness is 0, since they can’t pass their genes on to future generations. • So, only the AA and Aa individuals mate. They still generate some aa ...
Evolution and Medicine
... Professor Emeritus of Pediatrics and Biology Johns Hopkins University School of Medicine What has evolution to do with medicine, or medicine with evolution? To some, the answer is very little. To a patient in the grip of intense precordial pain, evolution is clearly irrelevant. So also might it seem ...
... Professor Emeritus of Pediatrics and Biology Johns Hopkins University School of Medicine What has evolution to do with medicine, or medicine with evolution? To some, the answer is very little. To a patient in the grip of intense precordial pain, evolution is clearly irrelevant. So also might it seem ...
Behavioral Ecology
... should perform such tests within natural systems where the sexual trait has undergone evolutionary diversification. Thus, a powerful way to test for a trade-off between natural and sexual selection is to experimentally manipulate only the male sexual signal and assess its conspicuity to predators or ...
... should perform such tests within natural systems where the sexual trait has undergone evolutionary diversification. Thus, a powerful way to test for a trade-off between natural and sexual selection is to experimentally manipulate only the male sexual signal and assess its conspicuity to predators or ...
December 2, 2016 - Mr. Scott`s Cyberdesk
... 10) What is the name of the era we currently are living in? ______________________ 11) Certain fossils suggest common ________________ among animals. 12) Charles Lyell suggested that Earth is very ____________. 13) Charles ____________ wrote The Origin of the Species by Means of Natural Selection. 1 ...
... 10) What is the name of the era we currently are living in? ______________________ 11) Certain fossils suggest common ________________ among animals. 12) Charles Lyell suggested that Earth is very ____________. 13) Charles ____________ wrote The Origin of the Species by Means of Natural Selection. 1 ...
A bit of history: the modern synthesis
... Species are developing continuously and die eventually out Similar organisms descent from a common ancestor Evolution occurs at slow pace, not by jumps Evolution proceeds by means of natural selection ...
... Species are developing continuously and die eventually out Similar organisms descent from a common ancestor Evolution occurs at slow pace, not by jumps Evolution proceeds by means of natural selection ...
Unit 7: Evolution - Blue Valley Schools
... that humans and bats have fairly similar skeletal structures, while whales have diverged considerably in the shapes and proportions of their bones. However, analysis of several genes in these species suggests that all three diverged from a common ancestor at about the same time. Which of the followi ...
... that humans and bats have fairly similar skeletal structures, while whales have diverged considerably in the shapes and proportions of their bones. However, analysis of several genes in these species suggests that all three diverged from a common ancestor at about the same time. Which of the followi ...
EVOLUTION (1) ENGLISH
... Left unchecked, populations tend to expand exponentially, leading to a scarcity of resources. In the struggle for existence, some individuals are more successful than others, allowing them to survive and reproduce. ...
... Left unchecked, populations tend to expand exponentially, leading to a scarcity of resources. In the struggle for existence, some individuals are more successful than others, allowing them to survive and reproduce. ...
BIOLOGY
... _____ Darwin was prompted to publish his ideas about evolution by A. an essay by Wallace on evolution B. the publication of Lamarck’s theory of evolution C. his wife Emma D. the work of Hutton and Lyell _____ Which of the following best describes how DARWIN would explain giraffes with long necks? A. ...
... _____ Darwin was prompted to publish his ideas about evolution by A. an essay by Wallace on evolution B. the publication of Lamarck’s theory of evolution C. his wife Emma D. the work of Hutton and Lyell _____ Which of the following best describes how DARWIN would explain giraffes with long necks? A. ...
CHAPTER 16 EVOLUTION OF POPULATIONS
... What is genetic drift? random change in allele frequencies that occurs in small populations ...
... What is genetic drift? random change in allele frequencies that occurs in small populations ...
Sexual selection and hermaphroditic organisms: Testing theory
... Joseph M. Long Marine Laboratory, University of California-Santa Cruz, Santa Cruz, CA 94019, USA ...
... Joseph M. Long Marine Laboratory, University of California-Santa Cruz, Santa Cruz, CA 94019, USA ...
Female Sexual Advertisement Reflects Resource Availability in
... Gross domestic product (GDP) figures for the UK, which measure the total economic activity within the economy, were used to assess relative resource availability over the past century. GDP figures for 1900 to 1983 were taken from Liesner (1985) and figures from 1948 to 2000 were taken from the UK Of ...
... Gross domestic product (GDP) figures for the UK, which measure the total economic activity within the economy, were used to assess relative resource availability over the past century. GDP figures for 1900 to 1983 were taken from Liesner (1985) and figures from 1948 to 2000 were taken from the UK Of ...
Darwin and Evolution
... Two types of sympatric speciation: a. autopolyploidy – when the new set of chromosomes belongs to a single species b. allopolyploidy – when the new set of chromosome comes from another species Polyploidy is much more common in plants than animals. Ex. Oats, cotton, potatoes, tobacco and wheat (is a ...
... Two types of sympatric speciation: a. autopolyploidy – when the new set of chromosomes belongs to a single species b. allopolyploidy – when the new set of chromosome comes from another species Polyploidy is much more common in plants than animals. Ex. Oats, cotton, potatoes, tobacco and wheat (is a ...
Evolution - Newark City Schools
... • With this information in his mind Darwin set sail on the H.M.S. Beagle (1831-1836) to survey the south seas to collect plants and animals. • On the Galapagos Islands, Darwin observed species that lived nowhere else in the world. ...
... • With this information in his mind Darwin set sail on the H.M.S. Beagle (1831-1836) to survey the south seas to collect plants and animals. • On the Galapagos Islands, Darwin observed species that lived nowhere else in the world. ...
Chapter 17
... 1. In time, as these aggregates became more complex and highly organized, they developed the ability to reproduce 2. At the point where the ability to reproduce had evolved, the aggregates were considered to be living cells ...
... 1. In time, as these aggregates became more complex and highly organized, they developed the ability to reproduce 2. At the point where the ability to reproduce had evolved, the aggregates were considered to be living cells ...
Evolutionary Theory, according to Darwin
... and all of our children live to reproduce, you are by definition more fit and better adapted than I am. ...
... and all of our children live to reproduce, you are by definition more fit and better adapted than I am. ...
Mechanisms of Evolution
... Occurs when organisms that are not closely related independently evolve (acquire)similar traits Wings evolved separately in: insects (arthropods) pterosaurs (extinct flying reptiles) birds (birds) bats (mammals) So, flight has evolved at least four separate times! How was the adaptation for flight u ...
... Occurs when organisms that are not closely related independently evolve (acquire)similar traits Wings evolved separately in: insects (arthropods) pterosaurs (extinct flying reptiles) birds (birds) bats (mammals) So, flight has evolved at least four separate times! How was the adaptation for flight u ...
Slide 1 - Cloudfront.net
... have the potential to increase rapidly – organisms produce far more offspring than can possibly survive Observation #2 - Nevertheless, the sizes of most natural populations and the resources available to support them remain relatively constant over time Conclusion #1 – Therefore, there is competitio ...
... have the potential to increase rapidly – organisms produce far more offspring than can possibly survive Observation #2 - Nevertheless, the sizes of most natural populations and the resources available to support them remain relatively constant over time Conclusion #1 – Therefore, there is competitio ...
E. Selection 1. Measuring “fitness” – differential reproductive
... Rate of change depends on the strength of selection; the difference in reproductive success among genotypes. In this case, a new adaptive mutant allele has been produced in the population. The “selection differential”, s, is selection AGAINST the existing allele that had become ‘fixed’ in the popula ...
... Rate of change depends on the strength of selection; the difference in reproductive success among genotypes. In this case, a new adaptive mutant allele has been produced in the population. The “selection differential”, s, is selection AGAINST the existing allele that had become ‘fixed’ in the popula ...
Darwin II
... C. Mechanism: Natural Selection 1. Transitional Observations 2. The Theory of Natural Selection "It is interesting to contemplate an entangled bank, clothed with many plants of many kinds, with birds singing on the bushes, with various insects flitting about, and with worms crawling through the dam ...
... C. Mechanism: Natural Selection 1. Transitional Observations 2. The Theory of Natural Selection "It is interesting to contemplate an entangled bank, clothed with many plants of many kinds, with birds singing on the bushes, with various insects flitting about, and with worms crawling through the dam ...
Sexual selection
![](https://commons.wikimedia.org/wiki/Special:FilePath/Paon_blanc_Madère_2008.jpg?width=300)
Sexual selection is a mode of natural selection where typically members of one gender choose mates of the other gender to mate with, called intersexual selection, and where females normally do the choosing, and competition between members of the same gender to sexually reproduce with members of the opposite sex, called intrasexual selection. These two forms of selection mean that some individuals have better reproductive success than others within a population either from being sexier or preferring sexier partners to produce offspring. For instance in the breeding season sexual selection in frogs occurs with the males first gathering at the water's edge and croaking. The females then arrive and choose the males with the deepest croaks and best territories. Generalizing, males benefit from frequent mating and monopolizing access to a group of fertile females. Females have a limited number of offspring they can have and they maximize the return on the energy they invest in reproduction.First articulated by Charles Darwin who described it as driving speciation and that many organisms had evolved features whose function was deleterious to their individual survival, and then developed by Ronald Fisher in the early 20th century. Sexual selection can lead typically males to extreme efforts to demonstrate their fitness to be chosen by females, producing secondary sexual characteristics, such as ornate bird tails like the peacock plumage, or the antlers of deer, or the manes of lions, caused by a positive feedback mechanism known as a Fisherian runaway, where the passing on of the desire for a trait in one sex is as important as having the trait in the other sex in producing the runaway effect. Although the sexy son hypothesis indicates that females would prefer male sons, Fisher's principle explains why the sex ratio is 1:1 almost without exception. Sexual selection is also found in plants and fungi.The maintenance of sexual reproduction in a highly competitive world has long been one of the major mysteries of biology given that asexual reproduction can reproduce much more quickly as 50% of offspring are not males, unable to produce offspring themselves. However, research published in 2015 indicates that sexual selection can explain the persistence of sexual reproduction.