The 23rd Session of the International Poplar Commission The Mechanism of 2n Pollen Formatiom in Populus × euramericana and P. × popularis Speaker Jin-feng Zhang (Jennifer) zjf@bjfu.edu.cn Beijing Forestry University P.R.China OUTLINE 1 Introduction 2 Materials and Methods 3 Results and Analysis 4 Discussion 1 Introduction 1.1 Polyploid breeding is an important part in poplar breeding ● ● Triploid white poplar trees Triploid and aneuploid hybrids in Populus trichocarpa ×
Premium Meiosis Gamete Pollen
Guanine and Thymine. The sequence of these bases on DNA determines the structure of these proteins. A gene is a sequence of bases which codes for a single polypeptide. Chromosomes carry these genes and these genes come in specific forms called an allele which is how living organisms vary from each other. For example‚ humans are made up of an XY or XX chromosome. Females are XX and males are XY‚ however in some animals their sex is determined by the ZW sex-determination
Premium Cell DNA Gene
Abstract The experiment is to identify the guilty suspect that is present at the crime scene by comparing with the DNA samples. Polymerase Chain Reaction(PCR) is used to amplify the small amount of Deoxyribonucleic Acid (DNA) for forensic or genetic studies‚ which require necessary product and placed in the thermal cycle. Gel electrophoresis is being run in order to analyze and compare the DNA samples at the crime scene with the guilty suspects. Gel electrophoresis is used to separate DNA using
Premium DNA DNA Polymerase chain reaction
was obtained‚ PV92 genotype data for the whole population‚ genotype frequency and allele frequency were analyzed. Genotype frequency was calculated by count total number of individual with specific genotype‚ such as “+/+” or “+/-” divided by the total number of individuals in the population. Allele frequency was calculated by the number of “+” or “-” alleles in the population divided by the total number of all alleles in the population‚ which is total number of individuals in the population multiples
Premium Genetics DNA Gene
of how populations change genetically over time. d. Gene pool: the total aggregate of genes in a population at any one time. It consists of all alleles at all gene loci in all individuals of the population 3. What is the Hardy-Weinberg Theorem and why does it appear to be an apparent contradiction to evolution? The theorem states that frequencies of alleles and genotypes will stay the same as long as the gametes are contributed to the next population at random. This appears to be a contradiction to
Premium Evolution Population genetics Natural selection
******************************************************************************************** Answer Sheet—Module 7 Lab DNA Extraction Click on the following link and view the DNA extraction: http://learn.genetics.utah.edu/content/labs/extraction/ 1. What is the source of the cells used in this demonstration? A human. 2. Give three practical uses of DNA that is extracted: a. Genetic testing b. Body Identification c. Forensic analysis 3. Name the piece of equipment
Premium DNA
discovered that traits pass down through families in different patterns. Sickle cell‚ which is an inherited disease‚ is mainly found in those of African descent. Mendel’s research ultimately helped lead to the discovery and understanding of the HBS allele‚ the connection of malaria to sickle cell now and in future generations‚ and the new technology that helps diagnose and treat sickle cell. In 1910‚ a black man named Walter Clement Noel‚ went to Dr. James B. Herrick‚ complaining of episodes of pain
Premium Malaria Sickle-cell disease Red blood cell
During the genetic drift‚ an unexpected change occurs in the environment which modifies a number of times the alleles are in a certain population. It is established that the origin of hemochromatosis in Europe first began thousands of years ago when the Vikings began to migrate to the coast. This has been known to spark the spread of the disease‚ which eventually became more prevalent in Europe. “When small populations‚ establish colonies in unpopulated or secluded areas‚ there is significant in
Premium
Unit One: Animal Structures and Functions‚ Answers to Review Questions Respiratory System 1. Indicate the importance of gas exchange in all living organisms. Respiration is gas exchange (Oxygen and Carbon Dioxide) with the external environment. All living things respire. Gas exchange is important so that cellular respiration can take place and energy can be made for the cells. 2. Distinguish among the terms cellular respiration‚ external respiration and internal respiration
Premium Blood Heart Oxygen
Before discussing the topic of genetic diversity‚ it is imperative that you‚ the reader‚ can get an understanding of what all topics and points of focus that is taken into consideration when discussing genetic diversity. This includes a brief history as to how this came about‚ and what components allow this process to occur. Genetic diversity can be a complicated‚ yet interesting topic to cover. From the name of the process of genetic diversity‚ it can be inferred that this deals with genes and
Premium DNA Gene Genetics