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Chapter 6
Chapter 6

... • Chromatin structure is changed by remodeling complexes that use energy provided by hydrolysis of ATP. • The SWI/SNF, RSC, and NURF complexes all are very large; – there are some common subunits. ...
to learn more
to learn more

... abnormal,  however,  the  disorder  becomes  apparent.  In  order  for  an  individual  to  have  two   abnormal  copies  of  a  gene,  an  abnormal  copy  of  the  gene  must  be  inherited  from  each  parent.   Couples  who  have ...
genetics test study guide
genetics test study guide

... 32. In mice, the gray fur gene (G) is dominant and the gene for black fur (g) is recessive. If 50% of a mouse litter is black, what parental cross probably produced this result? _____X_____ 33. If a man has type O blood, his red blood cells would have what type of antigen? ___________ 34. If “S” sta ...
The chromosomal theory of inheritance
The chromosomal theory of inheritance

... Human Heredity • Accidental changes in genes are called mutations  mutations occur only rarely and almost always result in recessive alleles • not eliminated from the population because they are not usually expressed in most individuals (heterozygotes) • in some cases, particular mutant alleles hav ...
Genetics Power Point
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... alleles • For example, if a purebred black cow is crossed with a purebred white cow, the cow will be both black and white. ...
Blueprint of Life - The Bored of Studies Community
Blueprint of Life - The Bored of Studies Community

... A 5-digit limb structured bone is found in many vertebrates such as frogs, whales, dogs, bats and humans, fish. This suggests that they shared a common ancestor. It hints at a shared ancestry ...
Punnett Square Practice
Punnett Square Practice

... Should This Dog Be Called Spot? Imagine this microscopic drama. A sex cell from a male dog joins with a sex cell from a female dog. Each dog’s sex cell carries 39 chromosomes. The zygote which results contains 78 chromosomes. It receives a set of chromosomes from each parent. Suppose you could look ...
Who are you? This question can be answered many ways…
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... • All genetic disorders are caused by a mutation • Mutation: A change in the genetic base-code for a protein. • A mutation can occur at almost any stage in development – DNA replication ,mitosis, meiosis, chromosome separation. • Environmental factors can lead to mutations as well. • Mutations can b ...
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DiseaseClinrevisionBhatiaZhaoChang 119.5 KB

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... • Chromosome mutations are normally large changes which are usually detectable under the microscope during cell division. • They usually occur during crossing over when the number or sequence of genes may be altered. • When a chromosome is broken it has a sticky end which can join onto other chromos ...
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... To determine which traits your baby will have, you will flip a coin to decide whether each allele is dominant or recessive. You will flip a coin twice for each trait. The first flip will determine the allele from the mother and the second flip will determine the allele from the father. A heads on th ...
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... Even though they did not know what the chemical (ultimately DNA) looked like they knew some of the mechanisms by which it acted. ...
Figure S1 - Genetics
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Relating Mendel`s Laws to Meiosis Name
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... 4. Each time we add a gene it doubles what we had. So 2 genes were 2 x 2 = 22 = 4, 3 genes is 4 x 2 = 23 = 8 and so on until we get to 22 genes. That’s 222= 4, 194,304 unique combinations. That’s just possible sperm or eggs. Combine those and you get a possible 17 trillion unique children from one c ...
5. Why are there several children with Down syndrome in my family?
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... joined end to end with another chromosome (only chromosomes 13, 14, 15, 21 or 22 are involved in Robertsonian translocations). It is not possible to determine from physical examination if a person has trisomy 21 or a Robertsonian translocation causing Down syndrome because both result in the same cl ...
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... Selective breeding is the traditional method for improving crops and livestock, such as increasing disease resistance or milk yield. Natural selection and selective breeding can both cause changes in animals and plants. The difference between the two is that natural selection happens naturally, but ...
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... • Alterations of chromosome number and structure are associated with some serious disorders • Some types of aneuploidy appear to upset the genetic balance less than others, resulting in individuals surviving to birth and beyond • These surviving individuals have a set of symptoms, or syndrome, chara ...
Patterns of Heredity Note Packet
Patterns of Heredity Note Packet

... CHROMOSOMAL MUTATIONS: changes in chromosomes, usually during meiosis when gametes are being made: 1. ___________________________= failure of homologous chromosomes to separate during meiosis resulting in gametes (egg or sperm) with too few or too many chromosomes.  REMEMBER: Humans are ___________ ...
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... More than 2 babies is even more rare Most of the time multiple births (more than 2) results from treatment of infertility: the inability to become pregnant ...
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Genetics - De Anza

... “units” specifying one trait segregated into gametes separately from “units” for other traits  Exception: Genes that have loci very close to one another on a chromosome tend to stay together during meiosis ...
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Deinococcus Radiodurans - sohs

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Polyploid



Polyploid cells and organisms are those containing more than two paired (homologous) sets of chromosomes. Most species whose cells have nuclei (Eukaryotes) are diploid, meaning they have two sets of chromosomes—one set inherited from each parent. However, polyploidy is found in some organisms and is especially common in plants. In addition, polyploidy occurs in some tissues of animals that are otherwise diploid, such as human muscle tissues. This is known as endopolyploidy. Species whose cells do not have nuclei, that is, Prokaryotes, may be polyploid organisms, as seen in the large bacterium Epulopicium fishelsoni [1]. Hence ploidy is defined with respect to a cell. Most eukaryotes have diploid somatic cells, but produce haploid gametes (eggs and sperm) by meiosis. A monoploid has only one set of chromosomes, and the term is usually only applied to cells or organisms that are normally diploid. Male bees and other Hymenoptera, for example, are monoploid. Unlike animals, plants and multicellular algae have life cycles with two alternating multicellular generations. The gametophyte generation is haploid, and produces gametes by mitosis, the sporophyte generation is diploid and produces spores by meiosis.Polyploidy refers to a numerical change in a whole set of chromosomes. Organisms in which a particular chromosome, or chromosome segment, is under- or overrepresented are said to be aneuploid (from the Greek words meaning ""not"", ""good"", and ""fold""). Therefore the distinction between aneuploidy and polyploidy is that aneuploidy refers to a numerical change in part of the chromosome set, whereas polyploidy refers to a numerical change in the whole set of chromosomes.Polyploidy may occur due to abnormal cell division, either during mitosis, or commonly during metaphase I in meiosis.Polyploidy occurs in some animals, such as goldfish, salmon, and salamanders, but is especially common among ferns and flowering plants (see Hibiscus rosa-sinensis), including both wild and cultivated species. Wheat, for example, after millennia of hybridization and modification by humans, has strains that are diploid (two sets of chromosomes), tetraploid (four sets of chromosomes) with the common name of durum or macaroni wheat, and hexaploid (six sets of chromosomes) with the common name of bread wheat. Many agriculturally important plants of the genus Brassica are also tetraploids.Polyploidy can be induced in plants and cell cultures by some chemicals: the best known is colchicine, which can result in chromosome doubling, though its use may have other less obvious consequences as well. Oryzalin will also double the existing chromosome content.
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