Campbell Biology
12th Edition
ISBN: 9780135188743
Author: Urry
Publisher: PEARSON
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Textbook Question
Chapter 21, Problem 21.5CR
How could chromosomal rearrangements lead to the emergence of new species?
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Why must the life cycle of sexually reproducing species alternate between haploid
and diploid stages?
A) Mitosis must occur at some point in the life cycle to prevent a doubling of
chromosomes in each generation.
B) Meiosis must occur at some point in the life cycle to prevent a doubling of
chromosomes in each generation.
C) Mitosis must occur at some point in the life cycle to prevent a reduction of
chromosomes in each generation.
D) Meiosis must occur at some point in the life cycle to prevent a reduction of
chromosomes in each generation.
How could chromosomal rearrangements lead to the emergence ofnew species?
What is one statement that would support the theory that all organisms are related?
A) The genetic code is almost universal.B) All flies have 2 wings.C) Eukaryotes have mitochondria.D) Prokaryotes have circular chromosomes.E) That the Theory of Pangenesis has held up to scrutiny for thousands of years
What is the difference between cross and self-fertilization? A. In cross-fertilization the gametes from one plant are used to fertilize the gametes of another plantB. In cross-fertilization the gametes from one plant are used to fertilize the gametes from the same plant
C. In self-fertilization the gametes from one plant are used to fertilize the gametes from another plantD. In cross-fertilization insects are used to pollinate the plants while in self-fertilization the investigator pollinates the plants
Chapter 21 Solutions
Campbell Biology
Ch. 21.1 - Describe the whole-genome shotgun approach.Ch. 21.2 - Prob. 1CCCh. 21.2 - Explain the advantage of the systems biology...Ch. 21.2 - Prob. 3CCCh. 21.2 - MAKE CONNECTIONS In Concept 20.2, you learned...Ch. 21.3 - The best estimate is that the human genome...Ch. 21.3 - The Genomes Online Database (GOLD) Website of the...Ch. 21.3 - WHAT IF? What evolutionary processes might...Ch. 21.4 - Discuss the characteristics of mammalian genomes...Ch. 21.4 - VISUAL SKILLS Which of the three mechanisms...
Ch. 21.4 - Contrast the organizations of the rRNA gene family...Ch. 21.4 - MAKE CONNECTIONS Assign each DNA segment at the...Ch. 21.5 - Describe three examples of errors in cellular...Ch. 21.5 - Explain how multiple exons might have arisen in...Ch. 21.5 - What are three ways that transposable elements are...Ch. 21.5 - WHAT IF? In 2005, Icelandic scientists reported...Ch. 21.6 - Prob. 1CCCh. 21.6 - Prob. 2CCCh. 21.6 - Prob. 3CCCh. 21 - How did the Human Genome Project result in more...Ch. 21 - What has been the most significant finding of the...Ch. 21 - Compare genome size, gene number, and gene density...Ch. 21 - Explain how the function of transposable elements...Ch. 21 - How could chromosomal rearrangements lead to the...Ch. 21 - What type of Information can be obtained by...Ch. 21 - Bioinformatics intludes all of the following...Ch. 21 - Homeotic genes (A) encode transcription factors...Ch. 21 - Prob. 3TYUCh. 21 - DRAW IT Below are the amino acid sequences(using...Ch. 21 - EVOLUTION CONNECTION Genes important in the...Ch. 21 - scientific inquiry The scientists mapping the SNPs...Ch. 21 - Prob. 7TYUCh. 21 - SYNTHESIZE YOUR KNOWLEDGE Insects have three...
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- If the parent diploid cell starts with 12 Chromosome and undergoes mitosis, then how many will the daughter cells have?A) 48 B) 12 C) 5 D) 24 20. If the parent diploid cell starts with 48 Chromosome and undergoes meiosis, then how many will the daughter cells have?A) 48 B) 12 C) 5 D) 24arrow_forwardWhich of the following can NOT be determined through cytogenetics? A) polyploidy B) chromosome inversions C) single gene mutations D) aneuploidy E) translocationsarrow_forwardIf two chromosomes of a species are the same length and have similar centromere placements and yet are not homologous, what is different about them? Choose 1: A) Genes are different B) Alleles are different C) Loci are different D) Nothing is differentarrow_forward
- 8) The diagram below represents a yeast cell that is in the process of budding, a form of asexual reproduction. Nucleus -Bud "Nucleus Which of the following statements describes the outcome of this process? A) The two cells that result will each contain half the species number of chromosomes. B) The two cells that result will have identical DNA. C) The bud will develop into a zygote. D) The bud will start to divide by the process of meiotic cell division.arrow_forwardWhich sentence does not describe a way in which genetic variation increases during meiosis? A) Random segregation of homologous chromosomes during metaphase/anaphase I. B) Random mutation of the genetic code during DNA replication. C) Random segregation of chromatids during metaphase/anaphase II. D) Crossing-over of homologous chromosomes, to exchange parts of their arms. 2. Choose the correct word to describe the physical, biochemical and behavioural characteristics of an individual, caused by how their genes interact with the environment? A) Morphology B) Genotype C) Physiology D) Phenotype 3. 0000 A) 25 % B) 50% C) 75 % D) 100 % 0000 Two individuals who are heterozygous for gene Y have a child. What is the probability that their child will be heterozygous for the gene? 0000arrow_forwardTranslocations occurs between A) homologous chromosomes B) Nonhomologous chromosomes C) homologous chromatids D) all of thesearrow_forward
- How many sets of chromosome do each of the following types of cell have? a) Diploid cell b) Haploid cell c). polyploid cell d) Gametesarrow_forwardVariations in chromosome structure are important for which of the following reason(s)?Question 5 options: A) evolution of new species B) may result in the production of abnormal offspring C) may alter the phenotype of an organism D) all of the answers are correctarrow_forwardMost eukaryotic organisms use sexual reproduction as their primary means of perpetuating their species. Gametes are formed via meiosis. However, some species primarily reproduce via asexual means. Reproduction is accomplished via mitosis. Aspen trees most commonly reproduce by such asexual methods of cloning.What are the advantages and disadvantages of reproduction by asexual means? Why do some species reproduce in this manner? Why don't all species?arrow_forward
- A) Give the diploid number of this organism. B) Is it mitosis or meiosis? Give two (2) elements on which you base your reasoning. C) Identify this mystery phase of the cell cycle. D) How many daughter cells will be produced at the end of the process and how many chromosomes (in numbers) will they contain? E) How does this process ensure the genetic variability of individuals of the species? Your answer must be based on two (2) different elements.arrow_forwardHow do hybridization and polyploidy cause a new plant species to form in as little as one generation?arrow_forwardWhich reproductive barrier is most likely to prevent interbreeding between a polyploid species and its diploid sister species?arrow_forward
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