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PROBLEM 1: What are the consequences of an inversion
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be viable in human beings are Turner syndrome (45,X) and monosomics of chromosomes 21 and 22, the two smallest autosomal chromosomes.
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PROBLEM 3: Ebony body (e) in ies is an autosomal re-
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Answer: In an inversion homozygote, the consequences are change in linkage arrangements, including new orders and map distances, and the possibility of position effects if a locus is placed into or near heterochromatin. In an inversion heterozygote, crossover suppression causes semisterility because zygotes that carry genic imbalances are lost. Inversion heterozygotes can be seen as meiotic loop structures or loops formed in endomitotic chromosomes such as those found in the salivary glands of fruit ies. In an evolutionary sense, inversions result in supergenes, locking together allelic combinations.
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PROBLEM 2: What are the consequences of a monosomic
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chromosome in human beings Answer: In human beings, monosomy is rare, meaning that, with few exceptions, it is lethal. In fact, monosomics are also rare in spontaneous abortions, indicating that most monosomic fetuses are lost before the woman is aware of the pregnancy. The only monosomics known to
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cessive trait. A true-breeding ebony female (ee) is mated with a true-breeding wild-type male that has been irradiated. Among the wild-type progeny is a single ebony male. Explain this observation. Answer: The cross is ee e e , and all F1s should be e e (wild-type). The use of irradiation alerts us to the possibility of chromosomal breaks, as well as simple mutations. What type of chromosomal aberration would allow a recessive trait to appear unexpectedly A deletion, which creates pseudodominance when there is no second allele, is a good possibility. The male in question could have gotten the ebony allele from its mother and no homologous allele from its father. Alternatively, the wild-type allele from the father could have mutated to an ebony allele.
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VARIATION IN CHROMOSOMAL STRUCTURE
A N D
P R O B L E M S*
1. What kind of gure is observed in meiosis of a reciprocal translocation homozygote 2. Can a deletion result in the formation of a variegation position effect If so, how 3. Does crossover suppression occur in an inversion homozygote Explain. 4. Which rearrangements of chromosomal structure cause semisterility 5. What are the consequences of single crossovers during tetrad formation in a reciprocal translocation heterozygote
* Answers to selected exercises and problems are on page A-9.
6. Give the gametic complement, in terms of acentrics, dicentrics, duplications, and de ciencies, when a three-strand double crossover occurs within a paracentric inversion loop. 7. In studying a new sample of fruit ies, a geneticist noted phenotypic variegation, semisterility, and the nonlinkage of previously linked genes. What probably caused this, and what cytological evidence would strengthen your hypothesis 8. In a second sample of ies, the geneticist found a position effect and semisterility. The linkage groups were correct, but the order was changed and crossing over was suppressed.What probably caused this, and what cytological evidence would strengthen your hypothesis
Tamarin: Principles of Genetics, Seventh Edition
II. Mendelism and the Chromosomal Theory
8. Cytogenetics
The McGraw Hill Companies, 2001
Exercises and Problems
9. Diagram the results of alternate segregation for a three-strand double crossover between a centromere and the cross center in a reciprocal translocation heterozygote. 10. A heterozygous plant A B C D E/a b c d e is testcrossed with an a b c d e/a b c d e plant. Only the following progeny appear. A B C D E/a b c d e a b c d e/a b c d e A b c d e/a b c d e a B C D E/a b c d e A B C D e/a b c d e a b c d E/a b c d e What is unusual about the results How can you explain them 11. White eye color in Drosophila is an X-linked recessive trait. A wild-type male is irradiated and mated with a white-eyed female. Among the progeny is a white-eyed female. a. Why is this result unexpected, and how could you explain it b. What type of progeny would you expect if this white-eyed female is crossed with a normal, nonirradiated male 12. You are trying to locate an enzyme-producing gene in Drosophila, which you know is located on the third chromosome. You have ve strains with deletions for different regions of the third chromosome (a slash / indicates a deleted region):
Normal Strain A Strain B Strain C Strain D Strain E 0 10 20 30 40 50 60 ////// ////////////////// //////////// //////////// //////////// map units
P1: F1: F2:
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