Sympatric speciation in parasites – what is sympatry?
... parasites with no choice could result in allopatric conditions, even if hosts are on overlapping ranges (i.e. sympatry). In these cases, the host represents a geographic locality for the parasite, and the distance between hosts, an extrinsic barrier (see Fig. 1a,b). A good illustration of this could ...
... parasites with no choice could result in allopatric conditions, even if hosts are on overlapping ranges (i.e. sympatry). In these cases, the host represents a geographic locality for the parasite, and the distance between hosts, an extrinsic barrier (see Fig. 1a,b). A good illustration of this could ...
A NEW TAIL-SHORT MUTATION IN THE MOUSE
... The inbred line which gave rise to the Ts mutants traced back to the C-strain (Bagg albinos), in certain matings in the F M generation, "tail-short" mice T J appeared— (nt means "normal tail" in this chart). numbers of normal and mutant offspring; while matings of mutant by mutant should gire about ...
... The inbred line which gave rise to the Ts mutants traced back to the C-strain (Bagg albinos), in certain matings in the F M generation, "tail-short" mice T J appeared— (nt means "normal tail" in this chart). numbers of normal and mutant offspring; while matings of mutant by mutant should gire about ...
Did sex chromosome turnover promote divergence of the major
... binding and bending through a specific angle. We speculate that SOX3 was truncated by breakage at the 50 end, and rejoining with a promotor that drove its expression into the bipotential gonad. B: Differentiation of the mammal X and Y chromosomes. Originally the X and Y were an ordinary pair of auto ...
... binding and bending through a specific angle. We speculate that SOX3 was truncated by breakage at the 50 end, and rejoining with a promotor that drove its expression into the bipotential gonad. B: Differentiation of the mammal X and Y chromosomes. Originally the X and Y were an ordinary pair of auto ...
An organism containing a normal chromosome complement and
... Other aneuploids (i.e. primary trisomics, tetrasomics, multiple trisomics, ...
... Other aneuploids (i.e. primary trisomics, tetrasomics, multiple trisomics, ...
Monohybrid Practice
... determine the genotypes of some of the plants you have been studying. You are presented with Plant A of this species. Plant A has pink flowers. What are the possible genotypes of Plant A? ______ or ______ You cross Plant A with Plant B, which has white flowers. What is the genotype of Plant B? _____ ...
... determine the genotypes of some of the plants you have been studying. You are presented with Plant A of this species. Plant A has pink flowers. What are the possible genotypes of Plant A? ______ or ______ You cross Plant A with Plant B, which has white flowers. What is the genotype of Plant B? _____ ...
The Maize Genome Poster
... research in maize genetics into practical applications. One event of particular impact was the demonstration of hybrid vigor, or heterosis, which results when two parental varieties, both showing reduced stature caused by inbreeding, are crossed to produce more robust hybrid offspring. Vigorous hybr ...
... research in maize genetics into practical applications. One event of particular impact was the demonstration of hybrid vigor, or heterosis, which results when two parental varieties, both showing reduced stature caused by inbreeding, are crossed to produce more robust hybrid offspring. Vigorous hybr ...
How Does Climate Influence Speciation?
... These verbal models suggest that climate may drive speciation through at least the two mechanisms of niche divergence and niche conservatism. First, when different populations of a species occupy different habitats, the different climatic conditions they inhabit may impose divergent selection that d ...
... These verbal models suggest that climate may drive speciation through at least the two mechanisms of niche divergence and niche conservatism. First, when different populations of a species occupy different habitats, the different climatic conditions they inhabit may impose divergent selection that d ...
Ecological speciation in phytophagous insects
... Divergent natural selection has been shown to promote speciation in a wide range of taxa. For example, adaptation to different ecological environments, via divergent selection, can result in the evolution of reproductive incompatibility between populations. Phytophagous insects have been at the fore ...
... Divergent natural selection has been shown to promote speciation in a wide range of taxa. For example, adaptation to different ecological environments, via divergent selection, can result in the evolution of reproductive incompatibility between populations. Phytophagous insects have been at the fore ...
How Does Climate Influence Speciation?
... These verbal models suggest that climate may drive speciation through at least the two mechanisms of niche divergence and niche conservatism. First, when different populations of a species occupy different habitats, the different climatic conditions they inhabit may impose divergent selection that d ...
... These verbal models suggest that climate may drive speciation through at least the two mechanisms of niche divergence and niche conservatism. First, when different populations of a species occupy different habitats, the different climatic conditions they inhabit may impose divergent selection that d ...
1. Soybeans are rich in protein. Raw soybeans, however, may
... What is the evidence from the map that suggests that Smith’s hare and the Natal rock hare are different species? ...
... What is the evidence from the map that suggests that Smith’s hare and the Natal rock hare are different species? ...
Brooker Genetics 5e Sample Chapter 02
... stimulate the egg onto its path of development. Of course, neither of these ideas was correct. The first systematic studies of genetic crosses were carried out by Joseph Kölreuter from 1761 to 1766. In crosses between different strains of tobacco plants, he found that the offspring were usually inte ...
... stimulate the egg onto its path of development. Of course, neither of these ideas was correct. The first systematic studies of genetic crosses were carried out by Joseph Kölreuter from 1761 to 1766. In crosses between different strains of tobacco plants, he found that the offspring were usually inte ...
12 | mendel`s experiments and heredity
... the process of inheritance involved a blending of parental traits that produced an intermediate physical appearance in offspring; this hypothetical process appeared to be correct because of what we know now as continuous variation. Continuous variation results from the action of many genes to determ ...
... the process of inheritance involved a blending of parental traits that produced an intermediate physical appearance in offspring; this hypothetical process appeared to be correct because of what we know now as continuous variation. Continuous variation results from the action of many genes to determ ...
Cytoplasmic male sterility
... genotypes (Table 3) could be expected to cause a complete restoration when in double doses in msm2 cytoplasm, Of the 49 partial restorer accessions with more than 0.1% F1 seed set (Table 3), 39 cytoplasms have been studied by crossing at least twice with cv. Adorra as the recurrent pollen parent. Th ...
... genotypes (Table 3) could be expected to cause a complete restoration when in double doses in msm2 cytoplasm, Of the 49 partial restorer accessions with more than 0.1% F1 seed set (Table 3), 39 cytoplasms have been studied by crossing at least twice with cv. Adorra as the recurrent pollen parent. Th ...
Chapter 15
... Copyright © 2008 Pearson Education, Inc., publishing as Pearson Benjamin Cummings ...
... Copyright © 2008 Pearson Education, Inc., publishing as Pearson Benjamin Cummings ...
lecture5(GS351)
... • Copied chromosomes (sister chromatids) stay joined together at the centromere. • Homologous chromosomes pair up and physically join at sites of recombination • Proteins pull the two homologs to opposite poles Meiotic Division 2 • Proteins pull the two sister chromatids to opposite poles • Each gam ...
... • Copied chromosomes (sister chromatids) stay joined together at the centromere. • Homologous chromosomes pair up and physically join at sites of recombination • Proteins pull the two homologs to opposite poles Meiotic Division 2 • Proteins pull the two sister chromatids to opposite poles • Each gam ...
physiological differentiation of vertebrate
... coloration (e.g. Allen's, Bergmann's, Gloger's) is highly questionable (39, 117, 139, 157, 173, 174, 252, 312, 327), and thorough "common garden" (60a) studies are rare (but see 77, 196, 252). Island populations also show characteristic patterns of gigantism or dwarfism (24, 25, 83, 226), but physio ...
... coloration (e.g. Allen's, Bergmann's, Gloger's) is highly questionable (39, 117, 139, 157, 173, 174, 252, 312, 327), and thorough "common garden" (60a) studies are rare (but see 77, 196, 252). Island populations also show characteristic patterns of gigantism or dwarfism (24, 25, 83, 226), but physio ...
K - Romanian Biotechnological Letters
... The non-conventional yeast Kluyveromyces lactis has become an excellent alternative yeast model organism [1, 2]. Reconsidered to be a distinct species [3, 4], K. lactis is an ascomyceteous budding yeast that belongs to the endoascomycetales [1]. There are important reasons for the increased attracti ...
... The non-conventional yeast Kluyveromyces lactis has become an excellent alternative yeast model organism [1, 2]. Reconsidered to be a distinct species [3, 4], K. lactis is an ascomyceteous budding yeast that belongs to the endoascomycetales [1]. There are important reasons for the increased attracti ...
A locus for sodium exclusion (Nax1), a trait for salt tolerance
... The landrace had very low rates of Na+ accumulation in the leaf blade, as low as bread wheat cultivars, and maintained a high rate of K+ accumulation, with consequent high K+ / Na+ ratios. The low-Na+ durum landrace had a K+ / Na+ ratio of 17 whereas the durum cultivars Wollaroi, Tamaroi and Langdon ...
... The landrace had very low rates of Na+ accumulation in the leaf blade, as low as bread wheat cultivars, and maintained a high rate of K+ accumulation, with consequent high K+ / Na+ ratios. The low-Na+ durum landrace had a K+ / Na+ ratio of 17 whereas the durum cultivars Wollaroi, Tamaroi and Langdon ...
References
... defined as attending the litter, sitting on the nest and suckling up to half the litter while ...
... defined as attending the litter, sitting on the nest and suckling up to half the litter while ...
Estimates of Selection and Gene Flow From Measures of
... Gene flow also causes gametic correlations (linkage disequilibria) between genes that differ across hybrid zones. Correlations are stronger when the hybrid zone is narrow, and rise to a maximum roughly equal to s. Thus cline width and gametic correlations combine to give estimates of gene flow and s ...
... Gene flow also causes gametic correlations (linkage disequilibria) between genes that differ across hybrid zones. Correlations are stronger when the hybrid zone is narrow, and rise to a maximum roughly equal to s. Thus cline width and gametic correlations combine to give estimates of gene flow and s ...
Patterns of heredity can be predicted.
... Look at the guinea-pig Punnett square on page 113. This cross is between two parents, each with one dominant allele (black) and one recessive allele (brown) for the trait fur color. In this cross, only one in four (ratio 1: 4) offspring gets two dominant alleles. That is, there is a one in four chan ...
... Look at the guinea-pig Punnett square on page 113. This cross is between two parents, each with one dominant allele (black) and one recessive allele (brown) for the trait fur color. In this cross, only one in four (ratio 1: 4) offspring gets two dominant alleles. That is, there is a one in four chan ...
The role of floral traits in structuring plant-pollinator interactions Clara Primante
... (proboscis length) (Brian 1957; Heinrich 1979; Lack 1982; Pleasants 1983; PrysJones & Corbet 1987; Inoue & Kato 1992; Fussell & Corbet 1992), pollinator traits have been less often considered. Surprisingly, following pioneering studies on pollination energetics (Heinrich 1975), the potential role of ...
... (proboscis length) (Brian 1957; Heinrich 1979; Lack 1982; Pleasants 1983; PrysJones & Corbet 1987; Inoue & Kato 1992; Fussell & Corbet 1992), pollinator traits have been less often considered. Surprisingly, following pioneering studies on pollination energetics (Heinrich 1975), the potential role of ...
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.↑ ↑ ↑ ↑