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Genetics Unit Test
Genetics Unit Test

... ------------------------------------------------------------------------------------------------------------11. Incomplete dominance is when no allele is completely dominant over the other. Ex.: red and white flowers that produce pink offspring. ------------------------------------------------------ ...
GA3 - thisisreza
GA3 - thisisreza

... All methods of evolutionary computation simulate natural evolution by creating a population of individuals, evaluating their fitness, generating a new population through genetic operations, and repeating this process a number of times. We will start with Genetic Algorithms (GAs) as most of the other ...
heredity (b)
heredity (b)

... 40. Mitosis is split into many stages. Name the 5 major stages (exclude prometaphase in all answers). Prophase, Metaphase, Anaphase, Telophase, Cytokinesis* 41. How many times does DNA replicate during the cell cycle and mitosis? Twice; once in S phase, once during mitosis * Cytokinesis is not techn ...
Note: Remove this blank sheet of paper from the exam and use it to
Note: Remove this blank sheet of paper from the exam and use it to

... Note: Consider the following additional information for questions 10-13. A different couple are normal for the cystic fibrosis trait have brown eyes. Brown eyes are inherited as an autosomal dominant trait, blue eyes are inherited as a recessive trait. B = brown, b = blue 10. The couple have a child ...
RRYY
RRYY

... chromosome from the parent of the opposite sex  A cell that contains both sets of homologous chromosomes is said to be diploid (meaning 2 sets)  A cell that contains only 1 set of chromosomes is called haploid – i.e. gametes ...
Unit: Reproduction and Growth
Unit: Reproduction and Growth

... Alleles – different forms of genes - meiosis separates chromosome pairs - gives each sex cell 1 allele for each trait Genetics – the study of how traits are inherited through the actions of alleles - Gregor Mendel – father of genetics Austrian monk (1822) Experimented with garden peas Thought is was ...
Slide 1
Slide 1

... female is born and Meiosis II happens for one egg each month before fertilization. Therefore the female is born with all her eggs but are not ready for ferilization until Meiosis II is completed. ...
Block I Study questions
Block I Study questions

... How are sex chromosomes made? In meiosis for humans, how many total chromosomes are produced in all 4 sex cells? 5) If long tails are a sex-linked trait, and mostly males have it, on which chromosome will it most likely be on? 6) Is colorblindness recessive, dominant or the result of incomplete domi ...
Practice problems (with answers) This is the degree of difficulty of
Practice problems (with answers) This is the degree of difficulty of

... The mother becomes pregnant. Amniocentesis shows that the fetus has a Y chromosome. The parents want to know whether the child will be affected. You conduct a PCR analysis of the disease gene of cells from the fetus? What are the possible results, and what will you tell the parents? If the child has ...
Genetics – Human Genetic Disorders and Genetic Engineering
Genetics – Human Genetic Disorders and Genetic Engineering

... DNA that you wish to copy. Primers act as signals to tell DNA polymerase where to copy. As the solution cools, they stick to the DNA you wish to copy and allow polymerase to do its job. 4. Heating the sample again unwinds the new duplicated strands; cooling again allows more primers to bind. If you ...
Meiosis Modeling Motion Lee H.S. 2nd Trimester: Biology B 2012
Meiosis Modeling Motion Lee H.S. 2nd Trimester: Biology B 2012

... Hour:_____ ...
Mitosis Flip-book
Mitosis Flip-book

... Format ...
Chapter 12 Review
Chapter 12 Review

... Who proposed that heredity factors carried on chromosomes?______________________ Who hypothesized chromosomes responsible for heredity?________________________ Who called these small parts “genes”?___________________________________________ Who’s work was rediscovered?_______________________________ ...
Biology Fall Review - SandersBiologyStuff
Biology Fall Review - SandersBiologyStuff

... Remember, this review sheet is meant to provide guidance for your studies, but is not an all-inclusive review of questions that will be asked on the test. Be sure to review all notes, worksheets, labs and assessments as well as the following chapters of your textbook: 1, 2, 7, 8, 9, 10, 11,12,14.1, ...
document
document

... in the other. Good examples: male pattern baldness in humans and horns in sheep. • Pattern baldness is found in both sexes, but is rarer in females. Females usually get very thin hair all over, instead of the classic receding hairline and bald spot on top that men get. • Baldness is autosomal, but i ...
BiologyDiagnostic (tohellwiththis)
BiologyDiagnostic (tohellwiththis)

... 35. A student hypothesizes that thick leg muscles are an inherited trait in dogs. The student collects data on several dogs, and the data show that dogs that live outdoors have thicker leg muscles than dogs that live indoors. What should the student conclude? A. Dogs that inherit thick leg muscles m ...
asexual reproduction
asexual reproduction

... Chromosome Types Autosomes and Sex Chromosomes  In humans and many other organisms, the two sex chromosomes are referred to as the X and Y chromosomes.  The genes that cause a zygote to develop into a male are ...
Modern Genetics
Modern Genetics

... Gene Linkage: If the genes of two different traits (non-allelic) are located on the same chromosome pair (homologous chromosomes) they are said to be linked, and are therefore inherited together. Crossing Over: In Meiosis 1(in Prophase) the chromatids of a pair of homologous chromosomes often twist ...
Unit 3 Review Guide Key Concepts Sickle cell disease is caused by
Unit 3 Review Guide Key Concepts Sickle cell disease is caused by

... Sickle Cell Disease- Individuals who are homozygous for the gene controlling hemoglobin S. The disease is characterized by the destruction of red blood cells and by episodic blocking of blood vessels by the adherence of sickle cells to the vascular endothelium. Thrombocytes (Platelets)- A minute col ...
Meiosis II
Meiosis II

... Interphase I ...
Cancer cells
Cancer cells

... destroys transformed cells – Some cells escape destruction and reproduce to form a tumor, a mass of abnormal cells ...
Genetics: The Science of Heredity
Genetics: The Science of Heredity

... very long, double stranded fiber that extends unbroken through the entire length of the chromosome. The amount of information a chromosome contains would fill about 280 printed books of 1000 pages each. Chromosomes come in different sizes. ...
Biology Exam Chapter 23
Biology Exam Chapter 23

... 24. used to determine genotype of one parent if other is known to be homozygous recessive c 25. produces four genetically unique haploid daughter cells g 26. rare changes in DNA d 27. occurs among non-sex cells m ...
Exam #1
Exam #1

... Multiple choice section: (15 points total – 3 per question) ...
The Chromosomal Basis of Inheritance
The Chromosomal Basis of Inheritance

< 1 ... 334 335 336 337 338 339 340 341 342 ... 538 >

Chromosome



A chromosome (chromo- + -some) is a packaged and organized structure containing most of the DNA of a living organism. It is not usually found on its own, but rather is complexed with many structural proteins called histones as well as associated transcription (copying of genetic sequences) factors and several other macromolecules. Two ""sister"" chromatids (half a chromosome) join together at a protein junction called a centromere. Chromosomes are normally visible under a light microscope only when the cell is undergoing mitosis. Even then, the full chromosome containing both joined sister chromatids becomes visible only during a sequence of mitosis known as metaphase (when chromosomes align together, attached to the mitotic spindle and prepare to divide). This DNA and its associated proteins and macromolecules is collectively known as chromatin, which is further packaged along with its associated molecules into a discrete structure called a nucleosome. Chromatin is present in most cells, with a few exceptions - erythrocytes for example. Occurring only in the nucleus of eukaryotic cells, chromatin composes the vast majority of all DNA, except for a small amount inherited maternally which is found in mitochondria. In prokaryotic cells, chromatin occurs free-floating in cytoplasm, as these cells lack organelles and a defined nucleus. The main information-carrying macromolecule is a single piece of coiled double-stranded DNA, containing many genes, regulatory elements and other noncoding DNA. The DNA-bound macromolecules are proteins, which serve to package the DNA and control its functions. Chromosomes vary widely between different organisms. Some species such as certain bacteria also contain plasmids or other extrachromosomal DNA. These are circular structures in the cytoplasm which contain cellular DNA and play a role in horizontal gene transfer.Compaction of the duplicated chromosomes during cell division (mitosis or meiosis) results either in a four-arm structure (pictured to the right) if the centromere is located in the middle of the chromosome or a two-arm structure if the centromere is located near one of the ends. Chromosomal recombination during meiosis and subsequent sexual reproduction plays a vital role in genetic diversity. If these structures are manipulated incorrectly, through processes known as chromosomal instability and translocation, the cell may undergo mitotic catastrophe and die, or it may unexpectedly evade apoptosis leading to the progression of cancer.In prokaryotes (see nucleoids) and viruses, the DNA is often densely packed and organized. In the case of archaea by homologs to eukaryotic histones, in the case of bacteria by histone-like proteins. Small circular genomes called plasmids are often found in bacteria and also in mitochondria and chloroplasts, reflecting their bacterial origins.
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