BIOLOGY
12th Edition
ISBN: 9781264839698
Author: Raven
Publisher: MCG CUSTOM
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Chapter 24.2, Problem 2LO
Summary Introduction
To determine: The reason that most crosses between two species do not result in a new polyploidy species.
Introduction: Polyploidy occurs when the cells undergo karyokinesis (a division of the nucleus) but fail to undergo cytokinesis (a division of the cytoplasm). This results in an increase in the haploid sets of chromosomes in the cells.
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Which of the ff. statements is NOTtrue:
A) Euploid is a good set of chromosome number
B) Monosomies are typically phenotypically normal than syndromic
C) Down syndrome can result from either a trisomy or a translocation
D) Polyploids in humans are nearly always lethal
Create a chromosome map each set of three genes from the given information.
a) The crossover frequency between gene A and gene B is 23%, the crossover frequency between gene B and gene C is 11%, and between gene A and C is 12%
Explain the difference between crossing over and reciprocal translocation. Give an example of a possible decease caused by reciprocal translocation.
Chapter 24 Solutions
BIOLOGY
Ch. 24.1 - Prob. 1LOCh. 24.1 - Prob. 2LOCh. 24.1 - Prob. 3LOCh. 24.2 - Prob. 1LOCh. 24.2 - Prob. 2LOCh. 24.2 - Prob. 3LOCh. 24.2 - Explain why genome size and genome number do not...Ch. 24.3 - Define the terms segmental duplication, genome...Ch. 24.3 - Prob. 2LOCh. 24.4 - Prob. 1LO
Ch. 24.4 - Prob. 2LOCh. 24.5 - Prob. 1LOCh. 24.5 - Prob. 2LOCh. 24.5 - Prob. 3LOCh. 24 - Prob. 1DACh. 24 - Prob. 1IQCh. 24 - Prob. 2IQCh. 24 - Prob. 3IQCh. 24 - Humans and pufferfish diverged from a common...Ch. 24 - Prob. 2UCh. 24 - Prob. 3UCh. 24 - Homologous genes in distantly related organisms...Ch. 24 - All of the following are believed to contribute to...Ch. 24 - What is the fate of most duplicated genes? a. Gene...Ch. 24 - Chimp and human DNA whole-genome sequences differ...Ch. 24 - Prob. 2ACh. 24 - Analyze the conclusion that the Medicago...Ch. 24 - Analyze why an herbicide that targets the...Ch. 24 - The FOX2 gene is associated with speech in human....Ch. 24 - One of the common misconceptions about sequencing...Ch. 24 - How does horizontal gene transfer (HGT) complicate...
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- Contrast the genetic composition of gametes derived from tetrads of inversion heterozygotes where crossing over occurs within a paracentric versus a pericentric inversion.Contrast the genetic composition of gametes derived from tetrads of inversion heterozygotes where crossing over occurs within a paracentric versus a pericentric inversion.arrow_forwardSuppose researchers studied the first chromosome of a new species and mapped three genes of interest, indicated as a, b, and c. A three‑factor cross was performed and the number of gametes formed from the F2 generation was recorded in a table. Note that the order of genes in the table is arbitrary. Calculate the recombination frequencies for each given gene pair in map units. a+ b+ c+ a b c a b+ c+ a+ b c a b+ c a+ b c+ a b c+ a+ b+ c 173 176 35 33 11 10 3 1 After completing the gene mapping, the researchers treated individuals to induce inversions in the chromosomes. After treatment, another three‑factor cross was performed and the number of gametes formed from the F2 generation was recorded in a second table. Note that the order of genes in the table is arbitrary. a+ b+ c+ abc a b+ c+ ?+ b c a b+ c a+ b c+ a b c+ a+ b+ c 188 185 24 26 1 0 49 46 Calculate the recombination frequencies for each given gene pair in map units.arrow_forwardCreate a chromosome map for each set of three genes from the given information. b) the crossover frequency between gene X and gene Z is 8.5 %, the crossover frequency between gene Y and gene Z is 2.25 % and between gene Y and gene X is 6.25 %arrow_forward
- Inversion heterozygosity occurs in organisms with one inverted chromosome and one noninverted homolog. Interestingly, chromosomal pairing between two such chromosomes is accomplished only if they form an inversion loop. Use the diagram to predict the consequences of a single crossover event within a paracentric inversion heterozygote during gamete formation.arrow_forwardA diploid species with 44 chromosomes (i.e., 22 per set) is crossedto another diploid species with 38 chromosomes (i.e., 19 per set).Define key terms. Make a calculation. Predict the outcome.arrow_forwardThe New World cotton species Gossypium hirsutum has a 2n chromosome number of 52. The Old World species G. thurberi and G. herbaceum each have a 2n number of 26. When these species are crossed, the resulting hybrids show the following chromosome pairing arrangements at meiosis: Interpret these observations phylogenetically, using diagrams. Clearly indicate the relationships between the species. How would you prove that your interpretation is correct?(PICTURE ADDED)arrow_forward
- Compare the following three terms: polyploidy, aneuploidy, and nondisjunction. Briefly discuss examples of each of these conditions.arrow_forwardThe radish (Raphanus sativus) has a diploid number (2n) of 18. The cabbage (Brassica oleracia) also has a diploid number (2n) of 18. Why is it that if you cross these two species to produce a hybrid with a total of 18 chromosomes in its somatic cells it is sterile, but if you form an allotetraploid (also known as amphidiploid) from these two species it is fertile?arrow_forwardExplain why heterozygotes for inversions and translocations have low fertility.arrow_forward
- Two haploid strains of S. cerevisae (yeast) are crossed. One has the genotype ABC and the other abc. Five sets of the resultant tetrads are noted below. In which set did a gene conversion event occur? Look for a 1:3 or 3:1 ratio A) abc, aBc, AbC, aBC a/A is 3 recessive 1dominant, B/b is 2:2, same for C B) abc, abc, ABC, ABC 2:2 for all C) aBc, aBc, AbC, AbC 2:2 for all D) abC, abc, ABc, ABC this one has equal ratio of dominant/recessive 2 dominant C’s, 2 Recessive c, same form A and a and B and b. E) Abc, Abc, aBC, aBCarrow_forwardAn individual is heterozygous for a reciprocal translocation, with the following chromosomes: A • B C D E F A • B C V W X R ST • U D E F R ST • U V W X Q. Explain why the fertility of this individual is likely to be less than the fertility of an individual without a translocation.arrow_forwardIn the figure below, black and pink lines are used to represent nonhomologous chromosomes. Which of the figures matches the following descriptions? More than one diagram may correspond to any one statement, and a diagram may be a correct answer for more than one question. 1) Gametes produced by a reciprocal translocation heterozygote: 2) Genetically balanced gametes produced by a reciprocal translocation heterozygote:arrow_forward
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genetic recombination strategies of bacteria CONJUGATION, TRANSDUCTION AND TRANSFORMATION; Author: Scientist Cindy;https://www.youtube.com/watch?v=_Va8FZJEl9A;License: Standard youtube license