The cytogenetics of homologous chromosome pairing in meiosis in plants Meiosis
... nuclei. Studies of Arabidopsis interphase nuclei show that high copy number repeats tend to cluster together, even though the arrangement of chromosome arms is largely random (Schubert et al., 2007). There is also evidence that heterochromatic regions of homologous chromosomes associate closely befo ...
... nuclei. Studies of Arabidopsis interphase nuclei show that high copy number repeats tend to cluster together, even though the arrangement of chromosome arms is largely random (Schubert et al., 2007). There is also evidence that heterochromatic regions of homologous chromosomes associate closely befo ...
The cytogenetics of homologous chromosome pairing in meiosis in
... nuclei. Studies of Arabidopsis interphase nuclei show that high copy number repeats tend to cluster together, even though the arrangement of chromosome arms is largely random (Schubert et al., 2007). There is also evidence that heterochromatic regions of homologous chromosomes associate closely befo ...
... nuclei. Studies of Arabidopsis interphase nuclei show that high copy number repeats tend to cluster together, even though the arrangement of chromosome arms is largely random (Schubert et al., 2007). There is also evidence that heterochromatic regions of homologous chromosomes associate closely befo ...
Structural and molecular differentiation of sex
... and WZ/ZZ with heterogametic females. Both systems can occur also in their numerical variants including more than two sex chromosomes or, in contrast, variants Z0/ZZ or XX/X0 which miss the heteromorphic sex chromosomes. The system with heterogametic males is universal in mammals and most insects, w ...
... and WZ/ZZ with heterogametic females. Both systems can occur also in their numerical variants including more than two sex chromosomes or, in contrast, variants Z0/ZZ or XX/X0 which miss the heteromorphic sex chromosomes. The system with heterogametic males is universal in mammals and most insects, w ...
PDF
... ferentiated in response to the conditions of a particular hahitat. Ecotypes may differ in growth habit, maturity, and other char acteristics such as pubegcence and flower color. Ecotypes of a given species ha.ve the same chromosome number and hybridize readily. Gregor (97) stressed that. an ecotype ...
... ferentiated in response to the conditions of a particular hahitat. Ecotypes may differ in growth habit, maturity, and other char acteristics such as pubegcence and flower color. Ecotypes of a given species ha.ve the same chromosome number and hybridize readily. Gregor (97) stressed that. an ecotype ...
Co-dominant SCAR marker for detection of the begomovirus
... accession, S. chilense LA2779, that has been used as a source of begomovirusresistance genes (Agrama and Scott, 2006); and the T0302 sequence for LA2779 was different from those for both M82-1-8 and H24. Most notably, the 120-nt indel associated with the fragments from M82-1-8 and H24 was not presen ...
... accession, S. chilense LA2779, that has been used as a source of begomovirusresistance genes (Agrama and Scott, 2006); and the T0302 sequence for LA2779 was different from those for both M82-1-8 and H24. Most notably, the 120-nt indel associated with the fragments from M82-1-8 and H24 was not presen ...
haustorium - Old Dominion University
... germination stimulation action (Nelson et al., 2009). This notion is fortified by the findings that parasitic plant germination activity is dependent on the part of the molecule attached to the D-ring (Zwanenburg et al., 2013), absent in karrikins (Chiwocha et al., 2009). Hence, the signal reception ...
... germination stimulation action (Nelson et al., 2009). This notion is fortified by the findings that parasitic plant germination activity is dependent on the part of the molecule attached to the D-ring (Zwanenburg et al., 2013), absent in karrikins (Chiwocha et al., 2009). Hence, the signal reception ...
Chromosomal Basis of Inheritance Final
... Genes present in the same chromosomes have a tendency to separate due to crossing over and hence produce recombinant progeny besides the parental type. The number of recombinant individuals is usually less than the number expected in independent assortment. In independent assortment all the four typ ...
... Genes present in the same chromosomes have a tendency to separate due to crossing over and hence produce recombinant progeny besides the parental type. The number of recombinant individuals is usually less than the number expected in independent assortment. In independent assortment all the four typ ...
Georgidis Hartebes Genetics
... A conventional approach to conserving hartebeest might aim to preserve or restore populations wherever they occurred naturally, particularly in protected areas. A more contemporary approach would attempt to conserve or even recreate the fragmented and diverse remnants of intricate evolutionary proce ...
... A conventional approach to conserving hartebeest might aim to preserve or restore populations wherever they occurred naturally, particularly in protected areas. A more contemporary approach would attempt to conserve or even recreate the fragmented and diverse remnants of intricate evolutionary proce ...
Final Exam Review
... A. Asexual reproduction increases genetic diversity, but sexual reproduction does not. B. Asexual reproduction involves one parent, and sexual reproduction involves two parents. C. Asexual reproduction increases a species’ chances of surviving unfavorable conditions, but sexual reproduction does not ...
... A. Asexual reproduction increases genetic diversity, but sexual reproduction does not. B. Asexual reproduction involves one parent, and sexual reproduction involves two parents. C. Asexual reproduction increases a species’ chances of surviving unfavorable conditions, but sexual reproduction does not ...
Evolution Of flowers And Inflorescences
... or determinate inflorescences. One way to convert an indeterminate inflorescence to a determinate condition would be to replace the main inflorescence apex by a flower. This is illustrated by centroradialis (cen) mutants of Antirrhinum (Stubbe, 1966) which produce a short raceme, terminated by a sin ...
... or determinate inflorescences. One way to convert an indeterminate inflorescence to a determinate condition would be to replace the main inflorescence apex by a flower. This is illustrated by centroradialis (cen) mutants of Antirrhinum (Stubbe, 1966) which produce a short raceme, terminated by a sin ...
design and optimisation of animal breeding programmes
... required by the retailers and consumers. The importance of these latter characteristics should be reflected – when the market systems functions well - in the prices paid to the commercial producers for their products. In the Western world, the interest of consumers in the system of production has in ...
... required by the retailers and consumers. The importance of these latter characteristics should be reflected – when the market systems functions well - in the prices paid to the commercial producers for their products. In the Western world, the interest of consumers in the system of production has in ...
8 VARIATION IN CHROMOSOME STRUCTURE AND NUMBER
... (in the lower chromatid). A crossover then occurs. This is called nonallelic homologous recombination because it has occurred at homologous sites (i.e., repetitive sequences), but the alleles of neighboring genes are not properly aligned. The result is that one chromatid has an internal duplication ...
... (in the lower chromatid). A crossover then occurs. This is called nonallelic homologous recombination because it has occurred at homologous sites (i.e., repetitive sequences), but the alleles of neighboring genes are not properly aligned. The result is that one chromatid has an internal duplication ...
13 Patterns of Inheritance Concept Outline 13.1 Mendel solved the mystery of heredity.
... A fourth advantage of studying peas is that the sexual organs of the pea are enclosed within the flower (figure 13.7). The flowers of peas, like those of many flowering plants, contain both male and female sex organs. Furthermore, the gametes produced by the male and female parts of the same flower, ...
... A fourth advantage of studying peas is that the sexual organs of the pea are enclosed within the flower (figure 13.7). The flowers of peas, like those of many flowering plants, contain both male and female sex organs. Furthermore, the gametes produced by the male and female parts of the same flower, ...
Fire and Drought: Soluble Carbohydrate Storage and
... the general abiotic features of the Cerrado, briefly introduce the taxonomic diversity of the herbaceous eudicots in the ground layer, and focus on the occurrence and ecophysiological significance of soluble carbohydrates, particularly fructans, in the belowground storage organs of these plants. The ...
... the general abiotic features of the Cerrado, briefly introduce the taxonomic diversity of the herbaceous eudicots in the ground layer, and focus on the occurrence and ecophysiological significance of soluble carbohydrates, particularly fructans, in the belowground storage organs of these plants. The ...
Genetic Improvement and Crossbreeding in Meat Goats
... Keeping accurate records is a key aspect in identifying the does that have a high level of productivity and efficiency in production. Efficiency in this case refers to the ratio of outputs (kids marketed) to inputs (operating costs and a portion of fixed costs --- shelter, breeding stock value, and ...
... Keeping accurate records is a key aspect in identifying the does that have a high level of productivity and efficiency in production. Efficiency in this case refers to the ratio of outputs (kids marketed) to inputs (operating costs and a portion of fixed costs --- shelter, breeding stock value, and ...
describe
... it—they certainly did not recognise its significance. The accepted belief at the time was the ‘blending’ of characteristics in the offspring of contrasting pure-breeding parents (e.g. a tall parent crossed with a short one was thought to give offspring of medium height). Mendel’s use of mathematics ...
... it—they certainly did not recognise its significance. The accepted belief at the time was the ‘blending’ of characteristics in the offspring of contrasting pure-breeding parents (e.g. a tall parent crossed with a short one was thought to give offspring of medium height). Mendel’s use of mathematics ...
6.1.1 Linking Mendel`s Findings to Modern Genetics
... it—they certainly did not recognise its significance. The accepted belief at the time was the ‘blending’ of characteristics in the offspring of contrasting pure-breeding parents (e.g. a tall parent crossed with a short one was thought to give offspring of medium height). Mendel’s use of mathematics ...
... it—they certainly did not recognise its significance. The accepted belief at the time was the ‘blending’ of characteristics in the offspring of contrasting pure-breeding parents (e.g. a tall parent crossed with a short one was thought to give offspring of medium height). Mendel’s use of mathematics ...
SEX DETERMINATION AND SEX CHROMOSOMES
... Dosage compensation refers to the phenomenon in which the level of expression of many genes on the sex chromosomes (e.g., the X chromosome) is similar in both sexes, even though males and females have a different complement of sex chromosomes. This term was coined in 1932 by Hermann Muller to explai ...
... Dosage compensation refers to the phenomenon in which the level of expression of many genes on the sex chromosomes (e.g., the X chromosome) is similar in both sexes, even though males and females have a different complement of sex chromosomes. This term was coined in 1932 by Hermann Muller to explai ...
The Experiments of Gregor Mendel
... The Role of Fertilization Mendel’s garden had several stocks of pea plants that were “true-breeding,” meaning that they were self-pollinating, and would produce offspring with identical traits to themselves. A trait is a specific characteristic of an individual, such as seed color or plant height, a ...
... The Role of Fertilization Mendel’s garden had several stocks of pea plants that were “true-breeding,” meaning that they were self-pollinating, and would produce offspring with identical traits to themselves. A trait is a specific characteristic of an individual, such as seed color or plant height, a ...
Nerve activates contraction
... Organisms with more than two complete sets of chromosomes, have undergone polypoidy. One gamete has Nondisjunction of all its chromosomes. ...
... Organisms with more than two complete sets of chromosomes, have undergone polypoidy. One gamete has Nondisjunction of all its chromosomes. ...
4 Probability and Heredity
... results. Mendel realized that the mathematical principles of probability applied to his work. He could say that the probability of such a cross producing a tall plant was 3 in 4. The probability of producing a short plant was 1 in 4. Mendel was the first scientist to recognize that the principles of ...
... results. Mendel realized that the mathematical principles of probability applied to his work. He could say that the probability of such a cross producing a tall plant was 3 in 4. The probability of producing a short plant was 1 in 4. Mendel was the first scientist to recognize that the principles of ...
Chapter
... of actually or potentially interbreeding populations, that is, the variation pattern on the population level within a species; and, third, the separation and divergence of populations or population systems as a result of the building up of isolating mechanisms, or the origin of species and consequen ...
... of actually or potentially interbreeding populations, that is, the variation pattern on the population level within a species; and, third, the separation and divergence of populations or population systems as a result of the building up of isolating mechanisms, or the origin of species and consequen ...
Mycobacterium kyorinense sp. nov., a novel, slow
... Sequence analysis revealed that the 16S rRNA gene sequence of the newly identified mycobacterium was closest to that of M. celatum ATCC 51130 (type 2) with 18 base mismatches out of 1469 bp (98.8 % identity). It was also highly similar to that of M. celatum NCTC 12882 (type 3) with 25 base mismatche ...
... Sequence analysis revealed that the 16S rRNA gene sequence of the newly identified mycobacterium was closest to that of M. celatum ATCC 51130 (type 2) with 18 base mismatches out of 1469 bp (98.8 % identity). It was also highly similar to that of M. celatum NCTC 12882 (type 3) with 25 base mismatche ...
Section 1
... reproductive cells join in a process known as fertilization to produce a new cell. In peas, this new cell develops into a tiny embryo encased within a seed. ...
... reproductive cells join in a process known as fertilization to produce a new cell. In peas, this new cell develops into a tiny embryo encased within a seed. ...
Document
... Mathematics of Probability Each time you toss a coin, there are two possible ways that the coin can land—heads up or tails up. Each of these two events is equally likely to occur. In mathematical terms, you can say that the probability that a tossed coin will land with heads up is 1 in 2. There is a ...
... Mathematics of Probability Each time you toss a coin, there are two possible ways that the coin can land—heads up or tails up. Each of these two events is equally likely to occur. In mathematical terms, you can say that the probability that a tossed coin will land with heads up is 1 in 2. There is a ...
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.↑ ↑ ↑ ↑