Hybrids in the Wild Enrichment LESSON 1
... Copyright © Glencoe/McGraw-Hill, a division of The McGraw-Hill Companies, Inc. ...
... Copyright © Glencoe/McGraw-Hill, a division of The McGraw-Hill Companies, Inc. ...
Using Crossbreeding and Hybrids
... • Breeding offspring of the same parents to each other. ( father x daughter, father x granddaughter etc.) • Used to produce a new generation without the introduction of any new genes. Desired result is to compound desirable characteristics. ...
... • Breeding offspring of the same parents to each other. ( father x daughter, father x granddaughter etc.) • Used to produce a new generation without the introduction of any new genes. Desired result is to compound desirable characteristics. ...
Lecture 14
... I. Initial population divided into two large halves (the "dumbbell" model) II. Initial population divided into one large half an one small, marginal half (the peripheral isolate model) 2. Sympatric speciation: Speciation in populations with overlapping geographic ranges In plants polyploidy can lead ...
... I. Initial population divided into two large halves (the "dumbbell" model) II. Initial population divided into one large half an one small, marginal half (the peripheral isolate model) 2. Sympatric speciation: Speciation in populations with overlapping geographic ranges In plants polyploidy can lead ...
changes the natural gene flow
... • The hybrids often contain favorable traits from both parents and are hardier (this phenomena is known as hybrid vigor) • Most all commercial corn (as well as most crops) are hybrids. • Current corn crops make 10 times the corn!!! • Hybrids are nearly all sterile (the exception = Wholphin) and unab ...
... • The hybrids often contain favorable traits from both parents and are hardier (this phenomena is known as hybrid vigor) • Most all commercial corn (as well as most crops) are hybrids. • Current corn crops make 10 times the corn!!! • Hybrids are nearly all sterile (the exception = Wholphin) and unab ...
Diapositiva 1 - Liceo Statale Cagnazzi
... The species are equipped of a large fertility and products. Some descendants can reach the adult stage; Populations of each species include about the same number of individuals; Food resources are limitated, but relatively constant during the time; Identical individuals are not produced by s ...
... The species are equipped of a large fertility and products. Some descendants can reach the adult stage; Populations of each species include about the same number of individuals; Food resources are limitated, but relatively constant during the time; Identical individuals are not produced by s ...
Intro to Natural Selection Sept 2008
... some are helpful, some are not. • Those with the helpful variation thrive and the tweezarian population eventually all display the “improved” variation. ...
... some are helpful, some are not. • Those with the helpful variation thrive and the tweezarian population eventually all display the “improved” variation. ...
Lecture #21 Date ______ Macroevolution
... speciation mode and happens when one of the isolated populations has very few individuals – also known as founder effect speciation. – genetic divergence arises largely through genetic drift and natural selection. – proposed explanation for the rapid speciation of Hawaiian Drosophila. Hawaiian fruit ...
... speciation mode and happens when one of the isolated populations has very few individuals – also known as founder effect speciation. – genetic divergence arises largely through genetic drift and natural selection. – proposed explanation for the rapid speciation of Hawaiian Drosophila. Hawaiian fruit ...
i. introduction
... a) All the members of a single species, occupying a particular area at the same time 2. Gene pool a) In a population, a gene pool represents all the various alleles of all the gene loci in all the members 3. Species a) Biological species (1) A group of interbreeding populations that share a gene poo ...
... a) All the members of a single species, occupying a particular area at the same time 2. Gene pool a) In a population, a gene pool represents all the various alleles of all the gene loci in all the members 3. Species a) Biological species (1) A group of interbreeding populations that share a gene poo ...
Macroevolution
... ancestor occupy the same niche, so they have the same characteristics. (ex. Porpoise and penguin) ...
... ancestor occupy the same niche, so they have the same characteristics. (ex. Porpoise and penguin) ...
Origin of Species Chapter 24
... What you need to know! • The difference between microevolution and macroevolution. • The biological concept of species. • Prezygotic and postzygotic barriers that maintain reproductive isolation in natural populations. • How allopatric and sympatric speciation are similar and different. • How an au ...
... What you need to know! • The difference between microevolution and macroevolution. • The biological concept of species. • Prezygotic and postzygotic barriers that maintain reproductive isolation in natural populations. • How allopatric and sympatric speciation are similar and different. • How an au ...
Adaptation and Speciation
... (physical adaptations, or even changes in breeding to produce when food is most heavily available.). ...
... (physical adaptations, or even changes in breeding to produce when food is most heavily available.). ...
Ch. 12 - Mechanisms of Speciation All life originated from a single
... § Sometimes called saltation events - polyploidization or other changes in chromosome karyotype. § In plants 40-70% of flowering plants are believed to arose by polyploidy § My dissertation on a diploid-tetraploid species pair of a grassland perennial that occurred in southern Colorado. v Mechanism ...
... § Sometimes called saltation events - polyploidization or other changes in chromosome karyotype. § In plants 40-70% of flowering plants are believed to arose by polyploidy § My dissertation on a diploid-tetraploid species pair of a grassland perennial that occurred in southern Colorado. v Mechanism ...
Zygotic Barriers (Macro 2)
... Sperm of one species may not be able to fertilize eggs of another species Ex: specific molecules on egg coat adhere to specific molecules on sperm ...
... Sperm of one species may not be able to fertilize eggs of another species Ex: specific molecules on egg coat adhere to specific molecules on sperm ...
SEA TURTLE HYBRIDIZATION IN BRAZIL
... The Brazilian hawksbill, Eretmochleys imbricata, nesting population is the largest known population in the South Atlantic. It is endangered and under pressure, especially from coastal development. Its distinctiveness has been revealed by genetic analyses, making it a priority for conservation. The l ...
... The Brazilian hawksbill, Eretmochleys imbricata, nesting population is the largest known population in the South Atlantic. It is endangered and under pressure, especially from coastal development. Its distinctiveness has been revealed by genetic analyses, making it a priority for conservation. The l ...
doc 3.7.3 evolution checklist
... variation in phenotype •• explain why genetic drift is important only in small populations •• explain how natural selection and isolation may result in change in the allele and phenotype frequency and lead to the formation of a new species •• explain how evolutionary change over a long period of tim ...
... variation in phenotype •• explain why genetic drift is important only in small populations •• explain how natural selection and isolation may result in change in the allele and phenotype frequency and lead to the formation of a new species •• explain how evolutionary change over a long period of tim ...
Practice Exam 4, Biology 211, Fall 2007
... d. Evolution proceeds by slow changes in populations over many generations. e. The motivating force for change is natural selection. 19. Which of the following most accurately describes the meaning of the term macroevolution? a. The origin of the first microorganisms. b. The evolutionary record cons ...
... d. Evolution proceeds by slow changes in populations over many generations. e. The motivating force for change is natural selection. 19. Which of the following most accurately describes the meaning of the term macroevolution? a. The origin of the first microorganisms. b. The evolutionary record cons ...
macroevolution
... (a) hybrid inviability: the hybrids do not live, for example, when two different species of frog mate but the hybrid does not survive. (b) hybrid sterility: the hybrids are not fertile, such as when a female horse and a male donkey mate to produce a sterile mule. (c) hybrid breakdown: there is progr ...
... (a) hybrid inviability: the hybrids do not live, for example, when two different species of frog mate but the hybrid does not survive. (b) hybrid sterility: the hybrids are not fertile, such as when a female horse and a male donkey mate to produce a sterile mule. (c) hybrid breakdown: there is progr ...
speciation - s3.amazonaws.com
... Allop. Spec. – STEP #3 The two species are formed due to an increase in the physical and behavioral differences accumulated by each species. ...
... Allop. Spec. – STEP #3 The two species are formed due to an increase in the physical and behavioral differences accumulated by each species. ...
File
... – Organisms that can interbreed under natural conditions and produce viable offspring Are lions and tigers the same species? Why? ...
... – Organisms that can interbreed under natural conditions and produce viable offspring Are lions and tigers the same species? Why? ...
Lecture #14 -Isolation and the Origin of Species Fall 2001
... aborted stamens, or more typically, infertile pollen. ...
... aborted stamens, or more typically, infertile pollen. ...
CHAPTER 23: Species and Their Formation
... D) actually or potentially interbreeding natural populations that are reproductively connected to other such groups. E) actually interbreeding natural populations that are reproductively connected to other such groups. 2. Which of the following is not a condition that favors allopatric speciation? A ...
... D) actually or potentially interbreeding natural populations that are reproductively connected to other such groups. E) actually interbreeding natural populations that are reproductively connected to other such groups. 2. Which of the following is not a condition that favors allopatric speciation? A ...
B chromosomes
... individuals in populations that carry them, and absent from others, which raises significant biological questions in terms of genome organisation, population cytogenetics and evolution. Bs were first discovered 100 years ago in an insect, in species of the leaf-footed plant bug Metapodius, by Edmund ...
... individuals in populations that carry them, and absent from others, which raises significant biological questions in terms of genome organisation, population cytogenetics and evolution. Bs were first discovered 100 years ago in an insect, in species of the leaf-footed plant bug Metapodius, by Edmund ...
Reproduction - Science
... Species that reproduce sexually have an advantage over those that reproduce asexually when external conditions change. This is how organisms have become adapted to their environment over time. – Describe the difference between sexual and asexual reproduction in terms of the genetic makeup of the off ...
... Species that reproduce sexually have an advantage over those that reproduce asexually when external conditions change. This is how organisms have become adapted to their environment over time. – Describe the difference between sexual and asexual reproduction in terms of the genetic makeup of the off ...
Activating Strategy AP Lesson #65
... – new species form in an empty environment – competition between species is minimal but increases with time – differences are selected for ...
... – new species form in an empty environment – competition between species is minimal but increases with time – differences are selected for ...
Hybrid (biology)
In biology a hybrid, also known as cross breed, is the result of mixing, through sexual reproduction, two animals or plants of different breeds, varieties, species or genera. Using genetic terminology, it may be defined as follows. Hybrid generally refers to any offspring resulting from the breeding of two genetically distinct individuals, which usually will result in a high degree of heterozygosity, though hybrid and heterozygous are not, strictly speaking, synonymous. a genetic hybrid carries two different alleles of the same gene a structural hybrid results from the fusion of gametes that have differing structure in at least one chromosome, as a result of structural abnormalities a numerical hybrid results from the fusion of gametes having different haploid numbers of chromosomes a permanent hybrid is a situation where only the heterozygous genotype occurs, because all homozygous combinations are lethal.From a taxonomic perspective, hybrid refers to: Offspring resulting from the interbreeding between two animal species or plant species. See also hybrid speciation. Hybrids between different subspecies within a species (such as between the Bengal tiger and Siberian tiger) are known as intra-specific hybrids. Hybrids between different species within the same genus (such as between lions and tigers) are sometimes known as interspecific hybrids or crosses. Hybrids between different genera (such as between sheep and goats) are known as intergeneric hybrids. Extremely rare interfamilial hybrids have been known to occur (such as the guineafowl hybrids). No interordinal (between different orders) animal hybrids are known. The third type of hybrid consists of crosses between populations, breeds or cultivars within a single species. This meaning is often used in plant and animal breeding, where hybrids are commonly produced and selected, because they have desirable characteristics not found or inconsistently present in the parent individuals or populations.↑ ↑ ↑ ↑