Population Genetics and Speciation
... two species to remain, there cannot be any gene flow (mating) between the two. Reproductive barriers that prevent reproduction are called isolating mechanisms ...
... two species to remain, there cannot be any gene flow (mating) between the two. Reproductive barriers that prevent reproduction are called isolating mechanisms ...
Darwin and Evolution
... increases an organism’s chance of survival • Types of adaptation– Camouflage – Mimicry – one species resembles another – Antimicrobial resistance ...
... increases an organism’s chance of survival • Types of adaptation– Camouflage – Mimicry – one species resembles another – Antimicrobial resistance ...
AP Biology Summer Assignment
... Two species of frogs mate in a laboratory setup and produce viable but sterile offspring. Two species of sea urchins release gametes at the same time, but the sperm fail to fuse with eggs of a different species. The genital openings of two species of land snails cannot line up because their shells s ...
... Two species of frogs mate in a laboratory setup and produce viable but sterile offspring. Two species of sea urchins release gametes at the same time, but the sperm fail to fuse with eggs of a different species. The genital openings of two species of land snails cannot line up because their shells s ...
How Populations Evolve
... Mechanical isolation- parts don’t fit Geographical isolation – never meet Temporal isolation – breed at different times Behavioral isolation – wrong courtship dance, wrong pheromones Gametic isolation – gametes will not fuse to form zygote-can’t line up or wrong molecular recognition mechanism of eg ...
... Mechanical isolation- parts don’t fit Geographical isolation – never meet Temporal isolation – breed at different times Behavioral isolation – wrong courtship dance, wrong pheromones Gametic isolation – gametes will not fuse to form zygote-can’t line up or wrong molecular recognition mechanism of eg ...
Evolutionary Types and Models - Free State High School Support
... In peripatric speciation, new species are formed in isolated, small peripheral populations which are then prevented from exchanging genes with the main population. Genetic drift is often proposed to play a significant role in peripatric speciation. ...
... In peripatric speciation, new species are formed in isolated, small peripheral populations which are then prevented from exchanging genes with the main population. Genetic drift is often proposed to play a significant role in peripatric speciation. ...
2 Intro to Mendelian Genetics 2013
... to generation for this to occur. (We now know these as GENES) Those traits that disappeared were recessive to other traits that were dominant. (GENES can be in different forms = ALLELES). ...
... to generation for this to occur. (We now know these as GENES) Those traits that disappeared were recessive to other traits that were dominant. (GENES can be in different forms = ALLELES). ...
Microorganisms associated with chromosome destruction and
... Thus, we conclude that elimination of the microorganism allows the two species to produce viable hybrids. Hybrid (female) offspring from both interspecific crosses are fertile, although there is increased mortality among their offspring (data not shown). Therefore, the species have diverged sufficie ...
... Thus, we conclude that elimination of the microorganism allows the two species to produce viable hybrids. Hybrid (female) offspring from both interspecific crosses are fertile, although there is increased mortality among their offspring (data not shown). Therefore, the species have diverged sufficie ...
WELCOME TO BIOLOGY 2002 - University of Indianapolis
... species have different light flashing patterns, and only the female of the same species recognizes the pattern as being courtship behavior. ...
... species have different light flashing patterns, and only the female of the same species recognizes the pattern as being courtship behavior. ...
The Lead-up to On the Origin of Species Species and classification
... when we come to inspect the watch, we perceive. . . that its several parts are framed and put together for a purpose, e.g. that they are so formed and adjusted as to produce motion, and that motion so regulated as to point out the hour of the day; that if the different parts had been differently sha ...
... when we come to inspect the watch, we perceive. . . that its several parts are framed and put together for a purpose, e.g. that they are so formed and adjusted as to produce motion, and that motion so regulated as to point out the hour of the day; that if the different parts had been differently sha ...
evolution - wentworth science
... • It was observed, in the 1800’s, that vertebrate embryos look quite similar to each other in early development • All vertebrates have gill slits at some point in their development. Only fish retain them in adulthood • The plausible explanation is that early forms had these traits and passed the gen ...
... • It was observed, in the 1800’s, that vertebrate embryos look quite similar to each other in early development • All vertebrates have gill slits at some point in their development. Only fish retain them in adulthood • The plausible explanation is that early forms had these traits and passed the gen ...
Flashcard Friday List #10 - Science with Mrs. Barton
... 1 Natural Selection: the process where organisms that are best suited to their environment survive and pass on their genetic traits in increasing number to the next generations. At the same time, organisms that are less adapted fail to survive or multiply at a lower rate and tend to be eliminated fr ...
... 1 Natural Selection: the process where organisms that are best suited to their environment survive and pass on their genetic traits in increasing number to the next generations. At the same time, organisms that are less adapted fail to survive or multiply at a lower rate and tend to be eliminated fr ...
Document
... b. What does homologous chromosomes mean? 12. Human gametes contain ______ autosomes and ______ sex chromosomes each. 13. In pedigrees, males are drawn as a _________ and females are drawn as a _________. a. How would you show someone is a carrier? 14. What is nondisjunction? a. Which chromosomes do ...
... b. What does homologous chromosomes mean? 12. Human gametes contain ______ autosomes and ______ sex chromosomes each. 13. In pedigrees, males are drawn as a _________ and females are drawn as a _________. a. How would you show someone is a carrier? 14. What is nondisjunction? a. Which chromosomes do ...
Bush Blitz vouchering policy
... Voucher specimens are only taken in particular circumstances – where a new species is suspected, where uncertainty about a species exists, or to provide a new record in a previously unsampled region. Groups in which vouchering is likely to occur include plants, invertebrates, freshwater fish, many r ...
... Voucher specimens are only taken in particular circumstances – where a new species is suspected, where uncertainty about a species exists, or to provide a new record in a previously unsampled region. Groups in which vouchering is likely to occur include plants, invertebrates, freshwater fish, many r ...
Allopatric and sympatric speciation
... • This can happen because plants can‘t choose whom to mate with (i.e. pollinators or wind may move pollen between flowers of different species • Hybrids may be sterile if paternal and maternal chromosomes are incompatible and cannot pair in meiosis. • But sometimes, chromosome sets “accidentally“ do ...
... • This can happen because plants can‘t choose whom to mate with (i.e. pollinators or wind may move pollen between flowers of different species • Hybrids may be sterile if paternal and maternal chromosomes are incompatible and cannot pair in meiosis. • But sometimes, chromosome sets “accidentally“ do ...
Study guide for Chapter 2 quiz full size
... This quiz will cover lessons 2.1, 2.2 and 2.3, with an emphasis on lesson 2.3 Important Vocabulary: 2.1) traits, gene, chromosome, genotype, phenotype 2.2) genetics, heredity, allele, Punnett square, dominant, recessive, homozygous, heterozygous, principle of segregation, law of independent assortme ...
... This quiz will cover lessons 2.1, 2.2 and 2.3, with an emphasis on lesson 2.3 Important Vocabulary: 2.1) traits, gene, chromosome, genotype, phenotype 2.2) genetics, heredity, allele, Punnett square, dominant, recessive, homozygous, heterozygous, principle of segregation, law of independent assortme ...
Natural selection and Selective Breeding PowerPoint
... how their ·beak adaptations allowed them to adapt to take advantage of food sources in ...
... how their ·beak adaptations allowed them to adapt to take advantage of food sources in ...
Speciation.2004
... • How is reproductive isolation important to speciation, and what forms can it take? • Why should natural selection reinforce reproductive isolation? • Can species be formed in ways other than geographic isolation? ...
... • How is reproductive isolation important to speciation, and what forms can it take? • Why should natural selection reinforce reproductive isolation? • Can species be formed in ways other than geographic isolation? ...
0534997295_32346
... Explain density-dependent population controls and density-independent population controls. ...
... Explain density-dependent population controls and density-independent population controls. ...
7. Evolution
... These events are responsible for variety and diversity within each species. Natural selection favors the organisms that are better suited to survive in a given environment. Those not well suited to the environment may die before they can pass on their traits to the next generation. As the environmen ...
... These events are responsible for variety and diversity within each species. Natural selection favors the organisms that are better suited to survive in a given environment. Those not well suited to the environment may die before they can pass on their traits to the next generation. As the environmen ...
The Diversity of Species
... Post-reproductive isolating mechanisms • Summarise the three types of postreproductive isolating mechanisms • Explain why hybrid sterility is not a barrier in plants as it is in animals. ...
... Post-reproductive isolating mechanisms • Summarise the three types of postreproductive isolating mechanisms • Explain why hybrid sterility is not a barrier in plants as it is in animals. ...
variation
... The particular version of a characteristic seen in an individual is described as their phenotype. Characteristics can show discrete variation or continuous variation Characteristics that fall into separate categories show discrete variation. Characteristics that show a wide range of values a ...
... The particular version of a characteristic seen in an individual is described as their phenotype. Characteristics can show discrete variation or continuous variation Characteristics that fall into separate categories show discrete variation. Characteristics that show a wide range of values a ...
EXAM 4-Fall2005.doc
... D) they all evolved from fish. E) they all possess DNA. 24) The many different breeds of domestic dog were produced by A) natural selection. B) artificial selection. C) kin selection D) mutation. E) divergent evolution. 25) Most commercial pesticides are effective for only 2-3 years. This is because ...
... D) they all evolved from fish. E) they all possess DNA. 24) The many different breeds of domestic dog were produced by A) natural selection. B) artificial selection. C) kin selection D) mutation. E) divergent evolution. 25) Most commercial pesticides are effective for only 2-3 years. This is because ...
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.↑ ↑ ↑ ↑