PDF-1 If an organism has 15 pairs of homologous chromosomes how many ch

2n 2n Meiosis 2 How many DNA molecules are present in a chromosome of a cell in metaphase of mitosis How many DNA molecules are present in a chromosome of a cell at metaphase II. 2n 2n Meiosis 2. How many DNA molecules are present in a chromosome of a cell in metaphase of mitosis? How many DNA molecules are present in a chromosome of a cell at metaphase II Homologous chromosomes . – identical chromosomes. . …same length, . centromere. , same staining pattern. . …exception…males sex chromosome. 1-22 . autosomes. . sex . chromsomes. Homologous chromosomes. CfE Advanced Higher Biology. Unit 2: Organisms and Evolution. 2bii. – Meiosis forms variable gametes. Terminology (4). Sexual life cycle of animals (1). Meiosis – an overview (1). Meiosis I (4). Chromosomes carry genes in a linear sequence that is shared by members of a species.. Understandings:. Prokaryotes have one chromosome consisting of a circular DNA molecule. . Some prokaryotes also have plasmids but eukaryotes do not. .. MEIOSIS. Parents can produce many types of offspring . Families will have resemblances, but no two are exactly alike. Every cell has a nucleus.     Every nucleus has chromosomes. The number of chromosomes depends on the species. A. The starter is broken.. B. The gas pedal of a car does not work at all.. C. The brake pedal of a car gets stuck while pushed down.. D. The brake pedal of a car does not work at all.. 2. ..  You have been asked to provide genetic counseling to a family who has a very high incidence of various types of cancer. After some discussion, you tell them that you will do some genetic testing to determine if they carry any mutations that predispose them to cancer. Mutations in which of following proteins are most commonly associated with cancers? . .. DNA . in cells is usually spread out so transcription can take place.. During . cell division, . chromosomes. form. .. Chromosomes are . DNA. and protein (. histones. ) coiled into a rod.. After DNA replicates, two . Meiosis (Ch 11.4) Background Chromosome = package form of DNA in a cell Genes = genetically inherited traits Genes normally have two alleles per gene (there are some exceptions like ABO blood type) Why do cells need to divide?. As . cells grow larger, they start to face several . difficulties . in functioning:. Growth & Repair. In order for multi-cellular organisms to grow, cells must divide. If cells are lost due to injury or damage to DNA, . 22 pairs of autosomes. 1 pair of sex chromosomes. XX = Female, XY = Male. Karyotype - chromosomes are arranged according to shape and size. AN EXTRA COPY OF CHROMOSOME 21 CAUSES DOWN SYNDROME. This condition is called . karyotype. is an important clinical method for diagnosing genetic disorders.  Explain why it is useful for diagnosing . monosomies. and . trisomies. .”  . (3 marks). Key Ideas. karyotype. = photograph of all the chromosomes in a cell. Get a flash card and quiz at least three people then have a seat to start your quick write.. Quick write. Continuity and Change. —All species tend to maintain themselves from generation to generation using the same genetic code. However, there are genetic mechanisms that lead to change over time, or evolution.. In asexual reproduction, a single individual gives rise to offspring that are identical to itself and . others [MITOSIS]. Bacteria reproduce asexually. Most plants and some simple animals can reproduce both asexually and . Genetics Pedagogies Project. Annie Jamieson (A.K.Jamieson@leeds.ac.uk). Human . karyotype. Source: http://www.genome.gov/glossary/resources/karyotype.pdf. Sex. chromosomes. Autosomes. Homologous chromosomes.