Genetic Analysis: An Integrated Approach (3rd Edition)
3rd Edition
ISBN: 9780134605173
Author: Mark F. Sanders, John L. Bowman
Publisher: PEARSON
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Chapter 10, Problem 12P
A pair of homologous chromosomes in Drosophila has the following content (single letters represent genes):
a. What term best describes this situation?
b. Diagram the pairing of these homologous chromosomes in prophase I.
c. What terms best describes the unusual structure that forms during pairing of these chromosomes?
d. How does the pairing diagrammed in part (b) differ from the pairing of chromosomes in an inversion heterozygote?
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a. What is the diploid number of chromosomes for a human?
b. What is the haploid number of chromosomes for a human?
Which cells are considered diploid, gametes or somatic cells?
C.
d. Which cells are considered haploid, gametes or somatic cells?
a. What letters are used to represent the short andlong arms of human chromosomes?b. Sketch a schematic diagram of a hypothetical chromosome 3 that has 3 regions with 2 bands each on the short arm and 5 regions with 3 bands each onthe long arm. Label the arms, regions, and bandsand indicate a gene at position 3p32.
A diploid species has 3 pairs of chromosomes in its somatic cells. In males, the first pair is large submetacentric[1]; the second is medium acrocentric[2], and the third is small telocentric[3]. In females, the first two pairs are like those of the males while the third is large metacentric[4][5], with satellite4 Illustrate the karyograms (drawing/picture of the chromosome) of the following:
A triploid cell in females
tetrasomic cell in males
tetraploid cell in females
[1] submetacentric --centrosome is just above the middle of the chromosome
[2] acrocentric --centrosome is much higher location than submetacentric so that the “p” arm of the chromosome is much shorter than the q arm
[3] telocentric --the centromere is at the end of the chromosome
[4] metacentric --centrosome is in the middle of the chromosome; thus the “p-arm” and the “q-arm” or both arms of the chromosome are equal in length
[5] satellite-a constriction in an arm of a chromosome, aside…
Chapter 10 Solutions
Genetic Analysis: An Integrated Approach (3rd Edition)
Ch. 10 - 10.1 Give descriptions for the following...Ch. 10 - 10.2 The human genome contains contains base...Ch. 10 - In eukaryotic DNA, Where are you most likely to...Ch. 10 - 10.4 Describe the importance of light and dark G...Ch. 10 - Human late prophase karyotypes have about 2000...Ch. 10 - Prob. 6PCh. 10 - From the following list, identify the types...Ch. 10 - 10.8 If the haploid number for a plant species is...Ch. 10 - Mating between a male donkey (2n=64) and a female...Ch. 10 - A researcher interested in studying a human gene...
Ch. 10 - 10.11 In what way does position effect variegation...Ch. 10 - 10.12 A pair of homologous chromosomes in...Ch. 10 - 10.13 An animal heterozygous for a reciprocal...Ch. 10 - Dr. Ara B. Dopsis has an idea he thinks will be a...Ch. 10 - A normal chromosome and its homolog carrying a...Ch. 10 - The accompanying chromosome diagram represents a...Ch. 10 - 10.17 Histone protein isolated from pea plants...Ch. 10 - 10.18 A survey of organisms living deep in the...Ch. 10 - In humans that XX/XO mosaics, the phenotype is...Ch. 10 - 10.20 A plant breeder would like to develop the...Ch. 10 - In Drosophilia, seven partial deletion (1to7)...Ch. 10 - Two experimental varieties of strawberry are...Ch. 10 - 10.23 In the tomato, Solanum esculentum, tall ()...Ch. 10 - A boy with Down syndrome (trisomy 21) has 46...Ch. 10 - Experimental evidence demonstrates that the...Ch. 10 - Prob. 26PCh. 10 - Genomic DNA from the nematode worm...Ch. 10 - 10.28 A small population of deer living on an...Ch. 10 - A eukaryote with a diploid number of 2n=6 carries...Ch. 10 - Prob. 30PCh. 10 - For the following crosses, determine as accurately...Ch. 10 - A healthy couple with a history of three previous...
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- In a turtle species, a diploid cell in the G1 phase of the cell cycle contains 22 picograms of DNA (picogram is a measure of the total mass of the DNA present). How much DNA is present in a cell of the same species at prophase II of meiosis (prophase of the second meiotic division)?arrow_forwardSomatic cells in organisms of a certain diploid plant species normally have 14 chromosomes. The chromosomes in the gametes are numbered from 1 through 7. Rarely, zygotes are formed that contain more or fewer than 14 chromosomes. A zygote that has the chromosome composition 111 22 33 44 555 66 77 is 1. A.) Anueploid or B.)Euploid , and its chromosome complement can be described as 2. A). trisomic , B.)allotriploid , C. autotriploid for chromosomes 1 and 5. Pick the correct letter for 1 and 2.arrow_forwardIn an electrophoretic gel across which is applied a powerful electrical alternating pulsed field, the DNA of the haploid fungus Neurospora crassa (n = 7) moves slowly but eventually forms seven bands, which represent DNA fractions that are of different sizes and hence have moved at different speeds. These bands are presumed to be the seven chromosomes. How would you show which band corresponds to which chromosome?arrow_forward
- 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?arrow_forwardTwo 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.arrow_forwardWe have discussed meiosis in yeast. One ascus e one melotic event. Two haploid yeast strains are crossed together, one wild type, the other mutant for 2 linked genes. The resulting diploid strain undergoes melosis eventually (=many meiotic events > many asci). A. What will the results be if the 2 genes are very far away from each other (certainly more than 50 map units)? B. What will the results be if the two genes are right next to each other, "no distance at all, zero distance"? (Explain your answers). Results here are patterns of asci and their percentages. Like for example "50% tetratypes, 0% ditypes", etc. If you forgot what a ditype or a tetratype is, you can illustrate them like that.arrow_forward
- A diploid species has 3 pairs of chromosomes in the somatic cells. In males, the first pair is large submetacentric; the second is medium acrocentric, and the third is small telocentric. In females, the first two pairs are like those of the males while the third is large metacentric with satellite. Illustrate the karyograms of the following: a. A triploid cell in femalesb. tetrasomic cell in malesc. tetraploid cell in femalesarrow_forwardAn individual heterozygous for a reciprocal translocation possesses the following chromosomes: A B • C D E F G A B • C D V W X R S • T U E F G R S • T U V W X a. Draw the pairing arrangement of these chromosomes in prophase I of meiosis. b. Diagram the alternate, adjacent-1, and adjacent-2 segregation patterns in anaphase I of meiosis. c. Give the products that result from alternate, adjacent-1, and adjacent-2 segregation.arrow_forwardThe cat has a diploid number 2n=38, describe the alignment of chromosomes on the metaphase plate during each phase below and indicate the number of chromosome structures aligned for each phase (single or synapsed structures). In other words, determine the number of structures present at the equatorial plate during metaphase and explain each configuration (the chromosome and chromatid arrangements) composition of each chromatid and if crossing over occurs. a. Mitosis b. Meiosis I c. Meiosis IIarrow_forward
- The normal sequence of nine genes on a certainDrosophila chromosome is 123 • 456789, where the dotrepresents the centromere. Some fruit flies were foundto have aberrant chromosomes with the followingstructures:a. 123 • 476589 c. 1654 • 32789b. 123 • 46789 d. 123 • 4566789Name each type of chromosomal rearrangement, anddraw diagrams to show how each would synapse withthe normal chromosome.arrow_forwardConsider a diploid organism in which the somatic cell chromosome number is 42. Assume cytokinesis to occur in mid telophase. A. How many chromosomes at the close of telophase of mitosis? B. How many chromosomes are expected at metaphase II of meiosis?arrow_forwardThe mutations called bobbed in Drosophila result from variable reductions (deletions) in the number of amplified genes coding for rRNA. Researchers trying to maintain bobbed stocks have often documented their tendency to revert to wild type in successive generations. Propose a mechanism based on meiotic recombination which could account for this reversion phenomenon. Why would wild-type flies become more prevalent in Drosophila cultures?arrow_forward
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