Sexual selection and speciation
... conflict can lead to runaway coevolution driving divergence. Also, in contrast to models where change occurs because of GENETIC DRIFT (see Glossary), sexual conflict generates direct selection on reproductive traits: divergence is expected to be more rapid when populations are larger. The generality ...
... conflict can lead to runaway coevolution driving divergence. Also, in contrast to models where change occurs because of GENETIC DRIFT (see Glossary), sexual conflict generates direct selection on reproductive traits: divergence is expected to be more rapid when populations are larger. The generality ...
lecture 8
... Modes of allelic interaction and initial efficiency of selection directional selection, inefficient ...
... Modes of allelic interaction and initial efficiency of selection directional selection, inefficient ...
Chapter 7 Evolution of Living Things
... populations. A few bacteria survive antibiotic treatment because they have an adaptation that makes them naturally resistant to, or not killed by, the antibiotic. The surviving bacteria continue to reproduce, and pass the adaptation to their offspring. After several generations, the population of ba ...
... populations. A few bacteria survive antibiotic treatment because they have an adaptation that makes them naturally resistant to, or not killed by, the antibiotic. The surviving bacteria continue to reproduce, and pass the adaptation to their offspring. After several generations, the population of ba ...
Section 1: Darwin`s Theory
... • An adaptation is any trait that helps an organism survive and reproduce in its environment. • Finches beak structure helps it get food • Flowers are brightly colored to attract bees and other insects ...
... • An adaptation is any trait that helps an organism survive and reproduce in its environment. • Finches beak structure helps it get food • Flowers are brightly colored to attract bees and other insects ...
Sexual selection and speciation
... conflict can lead to runaway coevolution driving divergence. Also, in contrast to models where change occurs because of GENETIC DRIFT (see Glossary), sexual conflict generates direct selection on reproductive traits: divergence is expected to be more rapid when populations are larger. The generality ...
... conflict can lead to runaway coevolution driving divergence. Also, in contrast to models where change occurs because of GENETIC DRIFT (see Glossary), sexual conflict generates direct selection on reproductive traits: divergence is expected to be more rapid when populations are larger. The generality ...
The influences of Buffon and Lyell on Darwin`s theory of evolution
... glaciation and erosion produced momentous change and spoke of an Earth with a deep past well beyond 6,000 years. Both Buffon and Lyell developed key insights about the natural world which influenced Darwin's evolutionary theory via natural selection. In a nutshell, the process of natural selectio ...
... glaciation and erosion produced momentous change and spoke of an Earth with a deep past well beyond 6,000 years. Both Buffon and Lyell developed key insights about the natural world which influenced Darwin's evolutionary theory via natural selection. In a nutshell, the process of natural selectio ...
Bringing together population and quantitative genetics
... Reviewed by JM Cano Arias Natural selection acts on the phenotype, although evolutionary change is only possible through changes to the genotype. Despite that fact, the genetic basis of phenotypic evolution has traditionally been studied by two complementary, but often disconnected, approaches. On t ...
... Reviewed by JM Cano Arias Natural selection acts on the phenotype, although evolutionary change is only possible through changes to the genotype. Despite that fact, the genetic basis of phenotypic evolution has traditionally been studied by two complementary, but often disconnected, approaches. On t ...
The Theory of Evolution
... They carefully selected from a group of hounds those who ran the fastest. From their offspring, the greyhound breeders again selected those dogs who ran the fastest. By continuing this selection for those dogs who ran faster than most of the hound dog population, they gradually produced a dog who co ...
... They carefully selected from a group of hounds those who ran the fastest. From their offspring, the greyhound breeders again selected those dogs who ran the fastest. By continuing this selection for those dogs who ran faster than most of the hound dog population, they gradually produced a dog who co ...
Social Homogamy Theory
... psychologist's explain that the mate selection process is likely to ensure that children were born and survived adulthood to reproduce, so that these genes were passed onto the next generation. Women preferred to be with men who would be good fathers, men preferred to mate with women who could bear ...
... psychologist's explain that the mate selection process is likely to ensure that children were born and survived adulthood to reproduce, so that these genes were passed onto the next generation. Women preferred to be with men who would be good fathers, men preferred to mate with women who could bear ...
Chapter 13: “The Theory of Evolution” Section 1: “The Theory of
... adapted to their environment are more likely to survive and will reproduce more successfully than those that do not have such traits. • Darwin called this differential rate of reproduction ________________________________ . • An ________________________ is a feature that has become common in a popul ...
... adapted to their environment are more likely to survive and will reproduce more successfully than those that do not have such traits. • Darwin called this differential rate of reproduction ________________________________ . • An ________________________ is a feature that has become common in a popul ...
Ch 13 evolution supliment - Elmwood Park Memorial High School
... – before other features typical of that group • For example, the oldest known bird – had feathers and the typical fused clavicles of birds, – but it also retained many reptile characteristics • Mosaic evolution is the concept that – organisms possess recently evolved characteristics – as well as som ...
... – before other features typical of that group • For example, the oldest known bird – had feathers and the typical fused clavicles of birds, – but it also retained many reptile characteristics • Mosaic evolution is the concept that – organisms possess recently evolved characteristics – as well as som ...
Chapter 15
... Darwin did not understand the reason for the diversity but he observed that many animals and plants varied noticeably among the different islands of the Galapagos. He began to wonder if they had once been members of the same species. ...
... Darwin did not understand the reason for the diversity but he observed that many animals and plants varied noticeably among the different islands of the Galapagos. He began to wonder if they had once been members of the same species. ...
Chapter 15
... Darwin did not understand the reason for the diversity but he observed that many animals and plants varied noticeably among the different islands of the Galapagos. He began to wonder if they had once been members of the same species. ...
... Darwin did not understand the reason for the diversity but he observed that many animals and plants varied noticeably among the different islands of the Galapagos. He began to wonder if they had once been members of the same species. ...
Evolution and Natural Selection Tutorial
... Lamarck proposed that changes in the environment caused an organism’s behavior to change, leading to greater use or disuse of a structure or organ. The structure would become larger or smaller as a result. Organism would then pass these changes on to its offspring. Idea is known as Inheritance of Ac ...
... Lamarck proposed that changes in the environment caused an organism’s behavior to change, leading to greater use or disuse of a structure or organ. The structure would become larger or smaller as a result. Organism would then pass these changes on to its offspring. Idea is known as Inheritance of Ac ...
Chapter 14
... One of the 18th & 19th centuries’ biologists who hypothesized that traits of species are not immutable, i.e., they can evolve See timeline Fig. 22.2 ...
... One of the 18th & 19th centuries’ biologists who hypothesized that traits of species are not immutable, i.e., they can evolve See timeline Fig. 22.2 ...
Evolution and Natural Selection Tutorial
... Lamarck proposed that changes in the environment caused an organism’s behavior to change, leading to greater use or disuse of a structure or organ. The structure would become larger or smaller as a result. Organism would then pass these changes on to its offspring. Idea is known as Inheritance of Ac ...
... Lamarck proposed that changes in the environment caused an organism’s behavior to change, leading to greater use or disuse of a structure or organ. The structure would become larger or smaller as a result. Organism would then pass these changes on to its offspring. Idea is known as Inheritance of Ac ...
ppt - Kyle Harms
... One of the 18th & 19th centuries’ biologists who hypothesized that traits of species are not immutable, i.e., they can evolve See timeline Fig. 22.2 ...
... One of the 18th & 19th centuries’ biologists who hypothesized that traits of species are not immutable, i.e., they can evolve See timeline Fig. 22.2 ...
Natural Selection (8a)
... (ability to survive, reproduce, and adapt) will survive and those with a lower level of fitness will die off. ...
... (ability to survive, reproduce, and adapt) will survive and those with a lower level of fitness will die off. ...
Personal Relationships
... Plain sex. Goldman Goldman’s definition of sexual desire: “a desire for contact with another person’s body and with the pleasure such contact produces”. Goldman argues that his “plain sex” definition is better than so-called “means-ends” definitions. What these definitions have in common is that the ...
... Plain sex. Goldman Goldman’s definition of sexual desire: “a desire for contact with another person’s body and with the pleasure such contact produces”. Goldman argues that his “plain sex” definition is better than so-called “means-ends” definitions. What these definitions have in common is that the ...
Ch.10.2 DR B Key
... Darwin believed that the finches on the islands were descendents of South American finches that were blown to the islands by a storm. Over many generations, he believed that the finches had adapted to life on the particular island. Match the correct description with the correct term. Write the lette ...
... Darwin believed that the finches on the islands were descendents of South American finches that were blown to the islands by a storm. Over many generations, he believed that the finches had adapted to life on the particular island. Match the correct description with the correct term. Write the lette ...
Practice Questions (269 KB pdf file)
... All the major groups of land living animals, except the birds, contain species that produce live babies. For animals that mate on land, fertilization within the female is the rule. Retaining fertile eggs within her body long enough for them to hatch there does not require major anatomical or physiol ...
... All the major groups of land living animals, except the birds, contain species that produce live babies. For animals that mate on land, fertilization within the female is the rule. Retaining fertile eggs within her body long enough for them to hatch there does not require major anatomical or physiol ...
Homework outline
... Ch. 16 continued…. TheProcess of Speciation Isolating Mechanisms Describe how populations that may be evolving may be isolated from each other. Be sure to explain reproductive isolation. ...
... Ch. 16 continued…. TheProcess of Speciation Isolating Mechanisms Describe how populations that may be evolving may be isolated from each other. Be sure to explain reproductive isolation. ...
Sex Differences in Susceptibility to Infection
... Testosterone alone, however, is not the sole means by which males and females differ in their physiology. A more general approach to the question of which sex is expected to have evolved greater disease susceptibility comes from life history theory, which examines the evolution of such life “decisio ...
... Testosterone alone, however, is not the sole means by which males and females differ in their physiology. A more general approach to the question of which sex is expected to have evolved greater disease susceptibility comes from life history theory, which examines the evolution of such life “decisio ...
How do species evolve?
... How does speciation happen? Speciation – genetic divergence within a population Need to prevent/reduce gene flow for species to form. Process is usually slow. Genetic divergence takes time ...
... How does speciation happen? Speciation – genetic divergence within a population Need to prevent/reduce gene flow for species to form. Process is usually slow. Genetic divergence takes time ...
Sexual selection
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.