Concepts of Genetics (12th Edition)
12th Edition
ISBN: 9780134604718
Author: William S. Klug, Michael R. Cummings, Charlotte A. Spencer, Michael A. Palladino, Darrell Killian
Publisher: PEARSON
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Chapter 9, Problem 5PDQ
In diploid yeast strains, sporulation and subsequent meiosis can produce haploid ascospores, which may fuse to reestablish diploid cells. When ascospores from a segregational petite strain fuse with those of a normal wild-type strain, the diploid zygotes are all normal. Following meiosis, ascospores are petite and normal. Is the segregational petite
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In a diploid organism, two homologous chromosomes synapse at prophase 1 of meiosis. One of the homologous chromosomes carries a sequence of four genes named A, B, C, and D. They get capital letters because each gene is dominant. On the two chromatids of the homologous chromosome, the same sequence of genes are all recessive. They are denoted a, b, c, and d. During prophase I of meiosis, when the homologous chromosomes synapse with one another, there is a crossover between two of the non-sister chromatid. These two chromatids break between genes B and C, as shown in the diagram below. They then reattach to the non-sister chromatid. What will each of these 2 chromatids carry after they separate from their sister chromatid in meiosis 2?
Chapter 9 Solutions
Concepts of Genetics (12th Edition)
Ch. 9 - Chlamydomonas, a eukaryoric green alga, may be...Ch. 9 - In aerobically cultured yeast, a petite mutant is...Ch. 9 - DNA in human mitochondria encodes 22 different...Ch. 9 - Prob. 4NSTCh. 9 - Why did Marcia choose mitochondrial testing to...Ch. 9 - Marcia saw an ad on television for ancestry DNA...Ch. 9 - How much importance should we place on the results...Ch. 9 - HOW DO WE KNOW? In this chapter, we focused on...Ch. 9 - Review the Chapter Concepts list on page 196. The...Ch. 9 - Streptomycin resistance in Chlamydomonas may...
Ch. 9 - A plant may have green, white, or green-and-white...Ch. 9 - In diploid yeast strains, sporulation and...Ch. 9 - Predict the results of a cross between ascospores...Ch. 9 - In Lymnaea, what results would you expect in a...Ch. 9 - In a cross of Lymnaea, the snail contributing the...Ch. 9 - In Drosophila subobscura, the presence of a...Ch. 9 - A male mouse from a true-breeding strain of...Ch. 9 - Consider the case where a mutation occurs that...Ch. 9 - What is the endosymbiotic theory, and why is this...Ch. 9 - In an earlier Problems and Discussion section (see...Ch. 9 - Mitochondrial replacement therapy (MRT) offers a...Ch. 9 - The specification of the anteriorposterior axis in...Ch. 9 - The maternal-effect mutation bicoid (bcd) is...Ch. 9 - (a) In humans the mitochondrial genome encodes a...Ch. 9 - Mutations in mitochondrial DNA appear to be...Ch. 9 - Researchers examined a family with an interesting...Ch. 9 - Payne, B. A. et al. (2013) present evidence that a...Ch. 9 - As mentioned in Section 9.3, mtDNA accumulates...Ch. 9 - Because offspring inherit the mitochondrial genome...
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- An equational division of mitosis is occuring for a diploid organism that has three heterologous chromosomes. One acrocentric, one metacentric and one telocentric. The organism is tetrahybrid and heterozygous for dominant and recessive alleles at four different loci. The parental genotypes were AAbbCCDD and aaBBccdd. Locus A and B are on the telocentric chromosome. Locus C is on a metacentric chromosome. Locus D is on the acrocentric chromosome. Question 1: How many chromosomes are observed during anaphase?arrow_forwardAn equational division of mitosis is occuring for a diploid organism that has three heterologous chromosomes. One acrocentric, one metacentric and one telocentric. The organism is tetrahybrid and heterozygous for dominant and recessive alleles at four different loci. The parental genotypes were AAbbCCDD and aaBBccdd. Locus A and B are on the telocentric chromosome. Locus C is on a metacentric chromosome. Locus D is on the acrocentric chromosome. Question: How many distinct gametes are possible if this cell goes through meiosis but does not have any crossing over (chiasma) during meiosis I. Write reasoning clearly.arrow_forwardAn equational division of mitosis is occuring for a diploid organism that has three heterologous chromosomes. One acrocentric, one metacentric and one telocentric. The organism is tetrahybrid and heterozygous for dominant and recessive alleles at four different loci. The parental genotypes were AAbbCCDD and aaBBccdd. Locus A and B are on the telocentric chromosome. Locus C is on a metacentric chromosome. Locus D is on the acrocentric chromosome. Question: Draw one possible representation of the chromosomes in a cell after the equational division of meiosis. Include all centromeres, chromatids and alleles.arrow_forward
- An equational division of mitosis is occuring for a diploid organism that has three heterologous chromosomes. One acrocentric, one metacentric and one telocentric. The organism is tetrahybrid and heterozygous for dominant and recessive alleles at four different loci. The parental genotypes were AAbbCCDD and aaBBccdd. Locus A and B are on the telocentric chromosome. Locus C is on a metacentric chromosome. Locus D is on the acrocentric chromosome. Question 3: What is the n value for this organism?arrow_forwardAn equational division of mitosis is occuring for a diploid organism that has three heterologous chromosomes. One acrocentric, one metacentric and one telocentric. The organism is tetrahybrid and heterozygous for dominant and recessive alleles at four different loci. The parental genotypes were AAbbCCDD and aaBBccdd. Locus A and B are on the telocentric chromosome. Locus C is on a metacentric chromosome. Locus D is on the acrocentric chromosome. Question 2: For cells of this organism that undergo meiosis, how many tetrads are observed during metaphase I?arrow_forwardAn equational division of mitosis is occuring for a diploid organism that has three heterologous chromosomes. One acrocentric, one metacentric and one telocentric. The organism is tetrahybrid and heterozygous for dominant and recessive alleles at four different loci. The parental genotypes were AAbbCCDD and aaBBccdd. Locus A and B are on the telocentric chromosome. Locus C is on a metacentric chromosome. Locus D is on the acrocentric chromosome. Part A: How many distinct gametes are possible if this cell goes through meiosis but does not have any crossing over (chiasma) during meiosis I. Explain your reasoning Part B: Draw one possible representation of the chromosomes in a cell after the equational division of meiosis. Include all centromeres, chromatids and alleles.arrow_forward
- An equational division of mitosis is occuring for a diploid organism that has three heterologous chromosomes. One acrocentric, one metacentric and one telocentric. The organism is tetrahybrid and heterozygous for dominant and recessive alleles at four different loci. The parental genotypes were AAbbCCDD and aaBBccdd. Locus A and B are on the telocentric chromosome. Locus C is on a metacentric chromosome. Locus D is on the acrocentric chromosome. Part A: How many chromosomes are observed during anaphase? Part B: For cells of this organism that undergo meiosis, how many tetrads are observed during metaphase I? Part C: What is the n value for this organism? Part D: How many distinct gametes are possible if this cell goes through meiosis but does not have any crossing over (chiasma) during meiosis I. Write reasoning clearly. Part E: Draw one possible representation of the chromosomes in a cell after the equational division of meiosis. Include all centromeres, chromatids and…arrow_forwardAn equational division of mitosis is occuring for a diploid organism that has three heterologous chromosomes. One acrocentric, one metacentric and one telocentric. The organism is tetrahybrid and heterozygous for dominant and recessive alleles at four different loci. The parental genotypes were AAbbCCDD and aaBBccdd. Locus A and B are on the telocentric chromosome. Locus C is on a metacentric chromosome. Locus D is on the acrocentric chromosome. Question: How many distinct gametes are possible if this cell goes through meiosis? Please write out calculation/work!!arrow_forwardAn equational division of mitosis is occuring for a diploid organism that has three heterologous chromosomes. One acrocentric, one metacentric and one telocentric. The organism is tetrahybrid and heterozygous for dominant and recessive alleles at four different loci. The parental genotypes were AAbbCCDD and aaBBccdd. Locus A and B are on the telocentric chromosome. Locus C is on a metacentric chromosome. Locus D is on the acrocentric chromosome. Part A: How many chromosomes are observed during anaphase? Part B: For cells of this organism that undergo meiosis, how many tetrads are observed during metaphase I? Part C: What is the n value for this organism?arrow_forward
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