THEME 2: Observe the figure below depicting cells undergoing meiosis and indicating which ones have a crossove between genes A and B in chromosome 1. XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX Use the figure to answer the questions a) What is the % of meiotic cells with a cross over between genes A and B? b) What is the % of recombinants? c) What is the frequency of recombination between A and B? d) What is the distance between the two genes in map units? e) What is the % of each recombinant type?

THEME 2: Observe the figure below depicting cells undergoing meiosis and indicating which ones have a crossove between genes A and B in chromosome 1. XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX Use the figure to answer the questions a) What is the % of meiotic cells with a cross over between genes A and B? b) What is the % of recombinants? c) What is the frequency of recombination between A and B? d) What is the distance between the two genes in map units? e) What is the % of each recombinant type?

Biology (MindTap Course List)

11th Edition

ISBN:9781337392938

Author:Eldra Solomon, Charles Martin, Diana W. Martin, Linda R. Berg

Publisher:Eldra Solomon, Charles Martin, Diana W. Martin, Linda R. Berg

Chapter11: The Basic Principles Of Heredity

Section: Chapter Questions

Problem 13TYU: VISUALIZE Sketch a series of diagrams showing each of the following, making sure to end each series...

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VISUALIZE Sketch a series of diagrams showing each of the following, making sure to end each series with haploid cells: (a)How a pair of alleles for a single locus segregate in meiosis (b)How the alleles of two unlinked loci assort independently in meiosis (c)How the alleles of two linked loci undergo genetic recombination
a) Explain why when a chiasma is formed, only 50% of the meiotic products will be of recombinant type. b) Determine the sequence of the three genes (y, cl and vg) that are linked on a chromosome based on the genetic distances provided below: y- vg 43 y- cl vg – cl 5 38
D) Monoploid 3 8 12 7- 2 4 9 14 4 10 6 11 17 13 t 19 9 21 21 15 5 20 22 15 17 18 7 1 83 12 6 13 X 14 29. Regarding the chromosome territories scheme (above), which of the following is correct? A) The cell is a from a human female (the X chromosome territory is on the right side) The sex of the original subject cannot be determined, as there is only one chromorome identified as no other X nor a Y chromosome can be seen. The cell is from a human male (the Y chromosome territory is hidden from view) C) D) None of the above
Sketch a series of diagrams showing each of the following, making sure to end each series with haploid cells:(a) How a pair of alleles for a single locus segregate in meiosis(b) How the alleles of two unlinked loci assort independently in meiosis(c) How the alleles of two linked loci undergo genetic recombination
Q1. A woman with Turner syndrome is found to be color-blind (an X-linked recessive phenotype). Both her mother and her father have normal vision. a) Explain the simultaneous origin of Turner syndrome and color blindness by the abnormal behavior of chromosomes at meiosis. b) Can your explanation distinguish whether the abnormal chromosome behavior occurred in the father or the mother? c) Can your explanation distinguish whether the abnormal chromosome behavior occurred at the first or second division of meiosis? d) Now assume that a color-blind Klinefelter man has parents with normal vision, and answer parts a, b, and c again.
Shown below are photomicrographs of Rhoeo tradescantia cells undergoing meiosis. Answer the following question for each of the photomicrographs: Identify the cytogenetic abnormality observed (ex. ring, chain, laggard, bridge). Identify the meiotic stage in which these aberrations are observed (as shown in the photomicrograph). Explain how these aberrations are formed and relate to the possible causal mutation(s). Will this result to sterile and/or fertile gametes? Explain.
The diagram below shows a cell during Meiosis II: a) What phase of Meiosis II is the cell in? How do you know? b) Assuming all of the chromosomes present during Meiosis II are shown in the figure above, how many chromosomes (counting homologous pairs as two chromosomes) does a gamete from this organism have? c) Draw the same cell during the same phase of Meiosis I. Label the elements
EC1. In drosophila the cw (curly wings) gene and eb (ebony body) genes are found on the same chromosome 20 map units apart. A cross was made between an ebony bodied parental strain and a curly winged parental strain and the F1’s were test crossed. a) What are the genotypes of the parental strains? b) What are the genotypes of the F1’s? c) What is the genotype of the tester strain? d) What progeny phenotypes and genotypes do you expect, and in what proportions? For phenotypes use the mutant phenotype for any that the flies have, and wild-type if they have none. EC2. Here is a tetrad produced by mating a H Y strain to an h y strain. a) What is the tetrad type? b) What has recombined with what? EC3. In corn, a dihybrid for the recessive genes a and b is test-crossed. The distribution of the phenotypes is as follows: A B 122A b 118a B 81a b 79 a) Do the genes appear to be sorting independently? Look at map units here. b) Test your hypothesis with a chi-squared test.
3. RR and Rr carrots are orange, and rr carrots are white. But in an Rr carrot, a rare mitotic recombination event occurred, that gave the red carrot a patch of white. a) Starting with chromosome pictures something like these, diagram this chromosome crossover event and then b) draw them lined up at metaphase and take the cell through mitosis, showing how the cell could produce daughter cell progeny that give the white phenotype. R
What is the mechanism of generating aneuploiding A) Mitotic unequal segregation of chromatidsB)Meiotic nondisjunction of chromosomesC) Mitotic nondisjunction of chromosomal pairs
In the past, the IOC has employed two genetic sex- determination tests. The Barr body test screens for the presence of two X chromosomes. In XX somatic cells, one copy of the X chromosome condenses into a largely inactive structure called a Barr body, which can be seen using a light microscope. In more recent years, a polymerase chain reaction-based screen has been used to amplify the DNA sequence of the SRY gene, which is found only on the Y chromosome. Based on their karyotypes, what would be the outcome of these two tests for each of the four individuals? Drag the labels to indicate the presence or absence of a Barr body and the SRY gene sequence.
3. (a) Describe. using clear headed sections, the various processes that give rise to the non-random rate of recombination across the genome. (b) Using simple diagrams, draw the different types of chromosome missegregation that can arise during meiosis. How might they be differentiated using a molecular assay?