File
... species produces more offspring that can survive; and the offspring with the most favorable traits are the most likely to survive and pass on their genes. Fossils help us because they show us remains or imprints of once-living organisms. A group of organisms that can mate with each other to produce ...
... species produces more offspring that can survive; and the offspring with the most favorable traits are the most likely to survive and pass on their genes. Fossils help us because they show us remains or imprints of once-living organisms. A group of organisms that can mate with each other to produce ...
Lecture 1
... Dude who published The Origin of Species. Evolution of deceptive resemblance in organisms. Features that result in increased survivorship & reproduction will tend to be passed on to offspring in next generation. Man who came up with the idea of natural selection independently of Darwin. Man who said ...
... Dude who published The Origin of Species. Evolution of deceptive resemblance in organisms. Features that result in increased survivorship & reproduction will tend to be passed on to offspring in next generation. Man who came up with the idea of natural selection independently of Darwin. Man who said ...
B6C-11 - De Anza
... The Evolutionary Enigma of Sexual Reproduction • Sexual reproduction produces fewer reproductive offspring than asexual reproduction, a so-called reproductive handicap ...
... The Evolutionary Enigma of Sexual Reproduction • Sexual reproduction produces fewer reproductive offspring than asexual reproduction, a so-called reproductive handicap ...
XYZW as nature`s language of love?
... into evolutionary dynamics, and can generate elegant explanations for many natural phenomena; the analysis of such imbalances is now one of the most exciting fields in modern evolutionary genetics. Most armchair viewers of TV nature programmes recognise that the paradigms of sexual selection are the ...
... into evolutionary dynamics, and can generate elegant explanations for many natural phenomena; the analysis of such imbalances is now one of the most exciting fields in modern evolutionary genetics. Most armchair viewers of TV nature programmes recognise that the paradigms of sexual selection are the ...
chapter 16 - Cloudfront.net
... Concepts of “Species” 1) Morphological: species defined by appearance Does not account for individual variations 2) Biological: species defined by reproduction ...
... Concepts of “Species” 1) Morphological: species defined by appearance Does not account for individual variations 2) Biological: species defined by reproduction ...
Summing up Natural Selection
... First to hypothesize a mechanism for changes in organisms because they were adapted to their environments. But, his Theory of Inheritance of Acquired Characteristics, incorrectly stated that animals can pass on traits that they developed during their lifetime. ...
... First to hypothesize a mechanism for changes in organisms because they were adapted to their environments. But, his Theory of Inheritance of Acquired Characteristics, incorrectly stated that animals can pass on traits that they developed during their lifetime. ...
Ch 11 Notes
... involving the union or fusion of two dissimilar gametes (differing either in size alone or in size and form). The smaller gamete is considered to be male (sperm cell), whereas the larger gamete is regarded as female (egg cell). Limitations on reproductive success differ for the sexes • Females are l ...
... involving the union or fusion of two dissimilar gametes (differing either in size alone or in size and form). The smaller gamete is considered to be male (sperm cell), whereas the larger gamete is regarded as female (egg cell). Limitations on reproductive success differ for the sexes • Females are l ...
evolutionary theory of gender roles
... Women invest far more in parenthood as they only produce one egg a month and each offspring involves nine months of pregnancy, then childbirth and months of nurturing, possibly breast feeding. A woman can only produce a few children in a life time. Reproductive success for the woman is making sure t ...
... Women invest far more in parenthood as they only produce one egg a month and each offspring involves nine months of pregnancy, then childbirth and months of nurturing, possibly breast feeding. A woman can only produce a few children in a life time. Reproductive success for the woman is making sure t ...
Chapter 15 - Net Start Class
... Summary of Darwin’s Theory 1. Organisms differ; variation is inherited 2. Organisms produce more offspring than survive 3. Organisms compete for resources 4. Organisms with advantages survive to pass those advantages to their children 5. Species alive today are descended with modifications from com ...
... Summary of Darwin’s Theory 1. Organisms differ; variation is inherited 2. Organisms produce more offspring than survive 3. Organisms compete for resources 4. Organisms with advantages survive to pass those advantages to their children 5. Species alive today are descended with modifications from com ...
Chapter 15 Notes Darwin on the HMS Beagle The Galápagos
... Chapter 15 Notes Darwin on the HMS Beagle ...
... Chapter 15 Notes Darwin on the HMS Beagle ...
File
... to occupy different niches over time 5. What conditions must be met for natural selection to occur? 1. natural selection occurs on genetically based traits (inherited traits) (genetically based) 2. mutations occur, which results in genetic variability in a population 3. Differential survival (since ...
... to occupy different niches over time 5. What conditions must be met for natural selection to occur? 1. natural selection occurs on genetically based traits (inherited traits) (genetically based) 2. mutations occur, which results in genetic variability in a population 3. Differential survival (since ...
Evolution of Sex, Part 1.
... Example of Natural Selection - Darwin's Galapagos Finches Different islands in the Galapagos have slightly different environments. Finches on these diff. islands have slighly diff. physical traits (are diff. species) that evolved to exploit resources available. (Ex. Diff. beak shapes and sizes) ...
... Example of Natural Selection - Darwin's Galapagos Finches Different islands in the Galapagos have slightly different environments. Finches on these diff. islands have slighly diff. physical traits (are diff. species) that evolved to exploit resources available. (Ex. Diff. beak shapes and sizes) ...
Men and Women
... One can, in effect, treat the sexes as if they were different species, the opposite sex being a resource relevant to producing maximum surviving offspring. - Robert Trivers (1972) ...
... One can, in effect, treat the sexes as if they were different species, the opposite sex being a resource relevant to producing maximum surviving offspring. - Robert Trivers (1972) ...
Evolution Quiz
... 13. ___________________ is when 2 unrelated organisms evolve similar traits due to a similar environment. 14. ____________________ is when many species evolve from a single species because of different environments. 15. It is believed that the earth is _____________________- old. 16. A collection of ...
... 13. ___________________ is when 2 unrelated organisms evolve similar traits due to a similar environment. 14. ____________________ is when many species evolve from a single species because of different environments. 15. It is believed that the earth is _____________________- old. 16. A collection of ...
Natural Selection 2
... • More offspring survive to sexual maturity and reproduce (causes competition) • Some individuals have traits that are better suited to their environment – they have desirable genetic information. More likely to be passed on to future offspring ...
... • More offspring survive to sexual maturity and reproduce (causes competition) • Some individuals have traits that are better suited to their environment – they have desirable genetic information. More likely to be passed on to future offspring ...
Questions for Lab 3
... Fig-Wasp Coevolution: NOTE: The captions for Figs. I & II are switched relative to their respective illustrations/photographs: pay attention to the captions and you shouldn’t be confused. If you don’t recall the difference between monoecious and dioecious plants, consult your intro biology textbook ...
... Fig-Wasp Coevolution: NOTE: The captions for Figs. I & II are switched relative to their respective illustrations/photographs: pay attention to the captions and you shouldn’t be confused. If you don’t recall the difference between monoecious and dioecious plants, consult your intro biology textbook ...
Exam 3 - Major Concepts
... o Natural Selection o Reproductive advantage o Change over time. Homology Homoplasy Genomic variation Evolutionary Concepts Evolutionary Process – make sure you understand the purpose of each of the three main steps: o Variation o Natural Selection o Heritability ...
... o Natural Selection o Reproductive advantage o Change over time. Homology Homoplasy Genomic variation Evolutionary Concepts Evolutionary Process – make sure you understand the purpose of each of the three main steps: o Variation o Natural Selection o Heritability ...
A) The evolution of sex
... Environment of offspring may be very different from that of their parent, parent’s adaptations may not be sufficient (e.g. Daphnia, aphids). Sex as a lottery: at least some progeny with reshuffled adaptations - direct individual selection advantage to parents in producing recombined, variable offspr ...
... Environment of offspring may be very different from that of their parent, parent’s adaptations may not be sufficient (e.g. Daphnia, aphids). Sex as a lottery: at least some progeny with reshuffled adaptations - direct individual selection advantage to parents in producing recombined, variable offspr ...
Natural Selection and Evolution
... 1. Knowledge of Geology—Darwin read Sir Charles Lyell’s book explaining the age of the Earth and many changes through time. 2. Artificial Selection by farmers—Darwin marveled at how complex traits could intentionally be selected for. 3. Theories of Thomas Malthus—Malthus observed that humans are bor ...
... 1. Knowledge of Geology—Darwin read Sir Charles Lyell’s book explaining the age of the Earth and many changes through time. 2. Artificial Selection by farmers—Darwin marveled at how complex traits could intentionally be selected for. 3. Theories of Thomas Malthus—Malthus observed that humans are bor ...
Natural Selection and Speciation Notes
... Variation: there are differences between the traits in these offspring ...
... Variation: there are differences between the traits in these offspring ...
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.