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... If any offspring show the recessive trait, the unknown is HETEROZYGOUS. If all the offspring show the dominant trait (and sufficient numbers of offspring are born to be reliable) the unknown is probably HOMOZYGOUS ...
Tree Breeding Tool Glossary
Tree Breeding Tool Glossary

... Elite population - Genetically advanced intensively managed population in a short term breeding program. Sometimes used in same meaning as nucleus population. Epistasis - Interaction between genes at different loci. F1 The first (Filial) generation after a cross. According to simple Mendelian geneti ...
Solutions for Problem Set Part A
Solutions for Problem Set Part A

... 1. Mendel produced purebred plants by allowing plants to self-pollinate. If any offspring bred true (showed the same trait as the parent), they were allowed to self-pollinate. After many generations of self-pollinating, if only a single trait ever showed in the offspring, then Mendel could be sure t ...
Lesson Overview
Lesson Overview

... Because the white forelock trait is dominant, all the family members in the pedigree lacking this trait must have homozygous recessive alleles. One of the grandfather’s children lacks the white forelock trait, so the grandfather must be heterozygous for this trait. ...
unit-2 genetics of prokaryotes and eukaryotic
unit-2 genetics of prokaryotes and eukaryotic

... spontaneous production may be facilitated by environmental factors and these may also be produced in the laboratory by artificial methods. Based on the point in the life cycle involved, haploid production systems can be broadly classified in three main categories namely: i) parthenogenesis and apoga ...
Genetic Structure of Coral Reef Organisms
Genetic Structure of Coral Reef Organisms

... In this section, the times of divergence of to those in the Indo-Pacific, but are likely populations or species of coral reef organ- to have been dominated by the tectonic events that uplifted the Isthmus of Panama. isms is reviewed. The time of divergence of However, it is worth noting that some au ...
Mendelian Genetics
Mendelian Genetics

... for his study of the inheritance of traits in pea plants. Mendel showed that the inheritance of traits follows particular laws, which were later named after him. The significance of Mendel's work was not recognized until the turn of the 20th century. Its rediscovery prompted the foundation of the di ...
phenotypic plasticity for fitness components in polygonum species of
phenotypic plasticity for fitness components in polygonum species of

... unpublished data). All four species reproduce by means of small, long-lived achenes (one-seeded fruits) produced in indeterminate spikes throughout the growth season. The species are all introduced in northeastern North America, where they occupy a common geographic range (Mitchell and Dean 1978, Gl ...
SUSCEPTIBILITY TO TRANSMITTED
SUSCEPTIBILITY TO TRANSMITTED

... The older literature concerning leukemia of mammals has been reviewed by Opie ( 3 ) . It is only within the past decade that the disease has been successfully transmitted in mice. Transmissible strains have been described by Korteweg (4), Richter and MacDowell ( 5 ) , Mercier and Gosselin ( 6 ) , Kr ...
Chapter 24: Patterns of Chromosome Inheritance
Chapter 24: Patterns of Chromosome Inheritance

... Traits controlled by genes on the X or Y chromosomes are sex-linked although most are unrelated to gender. An allele on the X chromosome that is in the region where the Y chromosome has no alleles will express even if recessive; it is termed X-linked. A female would have to have two recessive genes ...
PowerPoint Notes
PowerPoint Notes

... A. Mendel’s principles form the basis of modern genetics. Mendel’s principles include the following: 1. The inheritance of traits is determined by individual units known as ___________. ...
Insect Karyotyping
Insect Karyotyping

... cause them to be larger than normal, this is known as duplication. There is a certain (fictional) species of insect that normally has three pairs of chromosomes – two pairs of body chromosomes and one pair of sex chromosomes. Their normal karyotypes and genotypes are shown in Table #2. However, some ...
aeiab Meiosis
aeiab Meiosis

... location of genes on chromosomes. They reasoned that if chiasmata can form at any point between two homologous chromosomes, then the frequency of crossing over in the region between two different genes on a chromosomes should vary directly with the physical distance between the genes. When this hypo ...
Homologous Recombination in Agrobacterium: Potential
Homologous Recombination in Agrobacterium: Potential

... For permissions, please e-mail: [email protected] ...
Genetics
Genetics

... Each time Mendel studied a trait, he crossed two plants with different expressions of the trait and found that the new plants all looked like one of the two parents. He called these new plants hybrids (HI brudz) because they received different genetic information, or different alleles, for a trait f ...
Slide 1
Slide 1

... In males, a defective allele for any of these genes results in colorblindness, an inability to distinguish certain colors. The most common form, red-green colorblindness, occurs in about 1 in 12 males. Males have just one X chromosome. Thus, all X-linked alleles are expressed in males, even if they ...
Genetic Algorithms - Al
Genetic Algorithms - Al

... Genetic Algorithms Genetic Algorithms are often used to improve the performance of other AI methods such as expert systems or neural networks.  The method learns by producing offspring that are better and better as measured by a fitness function, which is a measure of the objective to be obtained ...
Broom Grass Report
Broom Grass Report

... thatch grass. Watering is done as and when required. The germination starts after two to three weeks of sowing. The grass cover is removed on germination of seeds and regular weeding and watering is done. After 4 to 6 weeks the seedlings are either transplanted to other beds at a spacing of 10 cm x ...
Chapter 11 Genetics Final Exam Review
Chapter 11 Genetics Final Exam Review

... Red throats (R) are dominant over white (r) throats in Goonie birds. Make a cross between a PURE RECESSIVE and a ...
Objectives 1-5 Genetics Review class notes
Objectives 1-5 Genetics Review class notes

... both parents are heterozygous (IA i ). In which case, it would be possible to produce a type O child 25% of the time (see Punnett square diagram below). ...
Case Report Section
Case Report Section

... On the basis of these morphological findings, a diagnosis of acute myeloid leukemia (FAB-M1 type) was made. 3p21 is a recurrent breakpoint in MDS/AML and tMDS/t-AML suggesting, 3p21 site is likely to contain a gene (genes) involved in the pathogenesis of t(3;4)(p21;q34). One previous case of t(3;4)( ...
Genes & Heredity
Genes & Heredity

... • represented by a capital letter ex. T (for tall) recessive allele: • codes for the trait that is not expressed (covered up) • represented by a lower case letter ex. t (for short) ...
Document
Document

... 13.1 Inheritance of Genes • Genes are the units of heredity, and are made up of segments of DNA • Genes are passed to the next generation via reproductive cells called gametes (sperm and eggs) • Each gene has a specific location called a locus on a certain chromosome • Most DNA is packaged into chr ...
Chromosome Theory
Chromosome Theory

... 3n Zygote ©1999 Timothy G. Standish ...
PATO - Buffalo Ontology Site
PATO - Buffalo Ontology Site

... • Framework for plant phenotype analyses – build a Plant PhenomeNet ...
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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.↑ ↑ ↑ ↑
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