A male Drosophila from a wild-type stock is discovered to have only 7 chromosomes, whereasnormally 2n = 8. Close examination reveals that one member of chromosome IV (the smallestchromosome) is attached to (translocated to) the distal end of chromosome II and is missing itscentromere, thus accounting for the reduction in chromosome number. (a) Diagram all members ofchromosomes II and IV in the male fly during synapsis in meiosis I. b) If this male mates with a femalewith normal chromosomes composition, what chromosomes compositions will occur in their progeny?Describe the type of chromosomal aberration that may occur in their progeny and indicatechromosome number for each progeny produced.

Part (a): Diagram of Chromosomes in the Male Fly During Synapsis in Meiosis IThe male Drosophila in…

Answered: A male Drosophila from a wild-type…

Human Anatomy & Physiology (11th Edition)

11th Edition

ISBN:9780134580999

Author:Elaine N. Marieb, Katja N. Hoehn

Publisher:Elaine N. Marieb, Katja N. Hoehn

Chapter1: The Human Body: An Orientation

Section: Chapter Questions

Problem 1RQ: The correct sequence of levels forming the structural hierarchy is A. (a) organ, organ system,...

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Similar questions

Assume that the Holliday junctions resolve so that there is no crossing over (that is, there is no recombination). For the maternal chromosome list all of the possible base identities at the three positions after the cell repairs any mismatches. Do the same for the paternal chromosome.”
Diploid Number of chromosomes, Sex Chromosomes, (+/- whole) Chromosome (+/- partial) e.g. 47, XY, +14 = male with trisomy of chromosome 14 e.g. 46, XX, 1q+ = female with a partial increase to the length of the long arm of chromosome 1 (partial increases or decreases to a single chromosome still have the same diploid number) What is the notation for the following case A boy having Down syndrome
What is dosage compensation with respect to the sex chromosomes? Briefly explain how this is accomplished in humans.
A cytogeneticist is studying the cells from an abnormal female monkey. In some cells, she finds that both X-chromosomes are active (i.e. not packaged into a Barr body), although one of the X-chromosomes appears shorter. She also finds that one of the autosomes are packaged as a Barr body, and she suspects that a translocation event might have been involved. By referring to the mechanism of X-chromosome inactivation, explain the observations made by the scientist
The karyotype of a young girl who is affected with Down syndrome revealed that she has 46 chromosomes. Her phenotypically normal older brother's karyotype revealed that he has 45 chromosomes. (a) Propose an explanantion for the chromosome number in both children (b) What would you expect the chromosome number of the parents of these two children?
consider the metaphase (mitosis) chromosome spread of the following related animal species. The first meiotic division in the hybrid animal shows a mixture of paired and single chromosomes. Why do you suppose this occurs? Can you suggest a possible relationship between the mixed chromosomes and the observed sterility of the hybrid?
During a practical, a group of biology students are tasked to study the cell cycle of an insect. This insect has the karyotype 2n=6, with genotype Aa Bb Ee HH. The students must draw a G2 cell about to enter meiosis, using red lines for maternal chromosomes, blue lines for paternal chromosomes and black dots to represent centromeres. The drawing provided by the students is shown below. a) Identify three mistakes the students made when producing this diagram. In your answer only refer to elements already present in the figure. (3) b) This fly is used in a testcross. What is the probability of producing a fly with genotype Aa bb ee Hh?
Rice has a chromosome number of 2n = 24. If different euploids and anaeuploids are available in rice, identifythe chromosomal mutation, chromosome configuration, chromosome number, and/or type of gametes in each of the mutations below. Complete the table. Example: for 10B, the answer is "10 II + 2 I"
Obvious differences in the position of chromosome copies are clear during metaphase of mitosis and meiosis. How would you describe these changes?
1) transposons are highly conserved DNA sequences that induce homologous recombination (true or false ) 2)Okazaki fragments are small pieces of RNA synthesized on the lagging strand during transcription (true or false) 3)homologous recombination is a eukaryotic chromatin exchange mechanism that is active during meiosis (true or false)
18. This question refers to the following schematic diagram of two normal chromosomes and five aberrant forms (A through E) of those chromosomes. (Circles represent centromeres and letters represent genetic loci). Which of the aberrant forms represents duplication? Normal Chromosomes (A) (B) | (D) (E)
Assume that the diploid number of a certain species is four chromosomes, two large and two small (2n=4). a) Of the following figures, which represents a 3n (triploid) cell in mitotic metaphase? b) For each of the wrong answers from part (a) above, explain briefly why it cannot represent a triploid cell in mitotic metaphase.

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