Two chromosomes have the ff. order of genes: Normal Abnormal A B C centromere DEFGHI A B G F E D centromere C H I (a) Does the abnormal chromosome have a pericentric or paracentric inversion? Why? (b) Draw a sketch to show how these two chromosomes would pair during synapsis, showing all four strands. In your sketch, assume crossing over has occurred between genes E and F. Illustrate the germ cells produced at the end of Meiosis II and describe these germ cells.

Two chromosomes have the ff. order of genes: Normal Abnormal A B C centromere DEFGHI A B G F E D centromere C H I (a) Does the abnormal chromosome have a pericentric or paracentric inversion? Why? (b) Draw a sketch to show how these two chromosomes would pair during synapsis, showing all four strands. In your sketch, assume crossing over has occurred between genes E and F. Illustrate the germ cells produced at the end of Meiosis II and describe these germ cells.

Human Biology (MindTap Course List)

11th Edition

ISBN:9781305112100

Author:Cecie Starr, Beverly McMillan

Publisher:Cecie Starr, Beverly McMillan

Chapter20: Chromosomes And Human Genetics

Section: Chapter Questions

Problem 3CT: People with Down syndrome have an extra copy of chromosome 21, for a total of 47 chromosomes....

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Two chromosomes have the ff. order of genes: Normal Abnormal A B C centromere DEFGHI A B G F E D centromere C H I (a) Does the abnormal chromosome have a pericentric or paracentric inversion? Why? (b) Draw a sketch to show how these two chromosomes would pair during synapsis, showing all four strands. In your sketch, assume crossing over has occurred between genes E and F. Illustrate the germ cells produced at the end of Meiosis II and describe these germ cells.
Two chromosomes have the ff. order of genes: Normal A B centromere C D E F G H I Abnormal a b centromere g f e d c h i a. Does the abnormal chromosome have a pericentric or paracentric inversion? Why? b. Draw a sketch to show how these two chromosomes (duplicated) would pair during synapsis. Assume a CO will occur between genes E and F. What gametes are ultimately formed at the end of telophase II and describe.
Changes in Chromosome Structure and Number An inversion heterozygote has homologous chromosomes with the following linkage arrangements:³ b • а b e a. What type of inversion is it? b. Draw the configuration of the chromosomes at synapsis of Prophase I. a с f d e d f с g c. If a four-strand double crossover occurs in the areas c-d (including chromatids 2 and 3) and e-f (including chromatids 1 and 4), what are the meiotic products? d. Repeat for a three-strand double crossover c-d (chromatids 2 and 3), and f-g (chromatids 1 and 3). e. For both types of double crossovers will any of the meiotic products be viable? If so which?
A somatic cell has the genotype DdEe. All chromosomes in this organism are metacentric. Show metaphase and the results of mitosis if the D and E locus are linked on the same chromosome in trans configuration. A sexually reproducing organism has the following phenotype DdEeAaTt: The D and E loci are on the same arm of a metacentric chromosome in cis configuration. The A locus is on the long arm of an acrocentric chromosome and the T locus is on a telocentric chromosome. 2.1. What is the haploid number of this organism? 2.2. Using diagrams show a ceii at metaphase of mitosis and show the results of mitosis.
Fill in the red numbers.
Within the blank cells, draw the phases of meiosis using 3 chromosome pairs. Thank you
● ● Illustrate the chromosome changes in interphase and mitosis using a diploid cell that is 2n=4 (two large and two small chromosomes). Label the circles as G1 and G2 stages of interphase and each phase of mitosis (in order). Draw the chromosome in each circle using the following guidelines. 1) For unreplicated chromosome draw a line (/) and for replicated chromosome draw an X. 2) For simplicity, do not indicate that the chromosomes are decondensed chromatin during interphase. 3) Skip drawing the nuclear membrane or spindle fibers, since we are focusing on the chromosomes. Label genes in the resulting daughter cells as A/a and B/b. (These letters represent genes which are at particular places along the DNA molecule. Each chromosomes can have a thousand genes but we are focusing on these two.) Ask me Qs in class if anythign on this is not clear.
An inversion heterozygote has the following inverted chromosome: Centromere ca a a A B CD JI HGF E, KL M Inverted region If a crossover occurred between genes H and I on one inverted and one normal chromosome, what would be the sequence of the dicentric chromosome before completion of metaphase I? A Cen B C D EFGHIJKL Cen M A Cen B C D JIHGFEKLM Cen JIH G F E Cen A Cen B C D JIHGFEDC B Cen A MLKEFGHIJKLM
ala Marked out of 1 Select one: OA. A Tissue Sample of Unknown Organism OB. B OC C D. D d. b. Mitosis must be carefully regulated to ensure the normal distribution of chromosomes to the daughter cells. A ring-shaped protein molecule known as cohesin attaches to the centromere of a chromosome and holds sister chromatids together to prevent their premature separation. Enzymes detach cohesin molecules from the centromere immediately before the sister chromatids segregate. -based on Nature, 2006 In which of the cells labelled in the diagram above are enzymes most likely acting to detach cohesin molecules from the centromere? Megee, Paul, 2006. Chromosome guardians on duty. Nature 441, no. 7089 (May 4): 35-36.
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Diagram A represents a chromosomal inversion event. A, B, C, D, E, F, are chromosomal loci. Represents a centromere. Diagram B shows a crossing over event between non-sister chromatids of a non-inverted and an inverted chromosome (darker vs. lighter lines) during meiosis I. Which of the following represents a recombinant chromosome resulting from the cross-over event shown in diagram B? А А в с D E MARK ALL THE ANSWES THAT APPLY. Inversion E B F B B EEEE B F F E в F A E D D с в А F В в F A E D в А
8.18 Irradiatioh of Drosophila sperm produces transloca- tions between the X chromosome and autosomes, between the Y chromosome and autosomes, and between different autosomes. Translotations between the X and Y chromosomes are not produced. Explain the absence of X-Y translocations. The birth of this child prompted the Dentons' physician to order a chromosome study of parents and child. The results of the study are shown in the accompanying fig- ure. Chromosome banding was done, and all chromo- somes were normal in these individuals, except some copies of number 6 and number 12. The number-6 and number-12 chromosomes of mother, father, and child are shown in the figure (the number 6 chromosomes are the larger pair): Child Mrs. Denton Mr. Denton a. Does either parent have an abnormal karyotype? If so, which parent has it, and what is the nature of the abnormality? b. How did the child's karyotype arise? (What pairing and segregation events took place in the parents?) e. Why is the child…