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Unit A Glossary
Unit A Glossary

... shows a trait that is different from either homozygote, and usually intermediate between them. 2. Inherit, inherited The passage of traits from parent to offspring. 3. Introduced species A species that has been moved by humans from its normal habitat to a new habitat, either intentionally or by mist ...
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Document

... 1. The SRY gene has been shown to trigger the development into a male fetus at about 2 months old. 2. SRY probably regulates other genes 3. Some XX male and XY females exist with mutated SRY genes ...
Study Guide - hrsbstaff.ednet.ns.ca
Study Guide - hrsbstaff.ednet.ns.ca

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... What is Meiosis? What are the two main functions of Meiosis? How are Mitosis and Meiosis alike and different? What types of cells are produced by meiosis? How many chromosomes does a somatic (body cells) human chromosome cell have? How many chromosomes does a human gamete (sperm or egg) have? What i ...
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Poster III
Poster III

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Reporting Category 2
Reporting Category 2

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105.1 Lastowska

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下載 - 國立高雄師範大學
下載 - 國立高雄師範大學

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Evolution and Natural Selection
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mutations - s3.amazonaws.com
mutations - s3.amazonaws.com

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interphase prophase metaphase anaphase telophase cytokinesis

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Genetics - msamandakeller
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... Describe the process of fertilization and the events that lead up to implantation (10 marks) Question 11 (M97/410/H(3)) a. Describe carefully the stages in one of Mendel’s experiments, in which independent assortment of genes was demonstrated. (8 marks) b. Explain why some genes do no assort indepen ...
Heredity – the passing of traits from parents to offspring
Heredity – the passing of traits from parents to offspring

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Speciation - WordPress.com
Speciation - WordPress.com

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C. Would you expect cells treated with methotrexate to produce

... abnormality (i.e., why are humans with trisomy 21 sometimes able to survive, while individuals with trisomy 1 are not)? Why is this factor so important? +1.5; The extent of the defect caused by a particular chromosomal abnormality is dependent on the number of genes/size of chromosome, as larger chr ...
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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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