Genetics: Analysis and Principles
6th Edition
ISBN: 9781259616020
Author: Robert J. Brooker Professor Dr.
Publisher: McGraw-Hill Education
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Chapter 6.1, Problem 1COMQ
Genetic linkage occurs because
a. genes that are on the same chromosome may affect the same character.
b. genes that are close together on the same chromosome tend to be transmitted together to offspring.
c. genes that are on different chromosomes are independently assorted.
d. none of the above.
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A geneticist determines that the order of four genes on a specific chromosome is CABD because the recombination frequencies were 35% for C-D, 24% for A-D, 23% for B-D, and 10% for A-B. What has the geneticist constructed?
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As a biologist, you complete a test cross between fly offspring to gain information about how two genes interact. You find that 20% of these test cross offspring are parental types and 80% are recombinant types. Which of the following is true based on these results?
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Chapter 6 Solutions
Genetics: Analysis and Principles
Ch. 6.1 - 1. Genetic linkage occurs because
a. genes that...Ch. 6.1 - In the experiment by Bateson and Punnett, which of...Ch. 6.2 - Prob. 1COMQCh. 6.2 - Prob. 2COMQCh. 6.2 - 3. For a chi square analysis involving genes that...Ch. 6.3 - Answer the multiple-choice questions based on the...Ch. 6.3 - Answer the multiple-choice questions based on the...Ch. 6.4 - 1. A tetrad of spores in an ascus is the product...Ch. 6.4 - Prob. 2COMQCh. 6.5 - 1. The process of mitotic recombination involves...
Ch. 6 - 1. What is the difference in meaning between the...Ch. 6 - 2. When a chi square analysis is applied to solve...Ch. 6 - 3. What is mitotic recombination? A heterozygous...Ch. 6 - 4. Mitotic recombination can occasionally produce...Ch. 6 - 5. A crossover has occurred in the bivalent shown...Ch. 6 - A crossover has occurred in the bivalent shown...Ch. 6 - A diploid organism has a total of 14 chromosomes...Ch. 6 - If you try to throw a basketball into a basket,...Ch. 6 - 9. By conducting testcrosses, researchers have...Ch. 6 - In humans, a rare dominant disorder known as...Ch. 6 - 11. When true-breeding mice with brown fur and...Ch. 6 - Though we often think of genes in terms of the...Ch. 6 - 13. If the likelihood of a single crossover in a...Ch. 6 - 14. In most two-factor crosses involving linked...Ch. 6 - Researchers have discovered that some regions of...Ch. 6 - 16. Describe the unique features of ascomycetes...Ch. 6 - Figure 6.1 shows the first experimental results...Ch. 6 - In the experiment of Figure 6.6, Stern followed...Ch. 6 - 3. Explain the rationale behind a testcross. Is it...Ch. 6 - 4. In your own words, explain why a testcross...Ch. 6 - Explain why the percentage of recombinant...Ch. 6 - 6. If two genes are more thanapart, how would you...Ch. 6 - 7. In Morgan’s three-factor crosses of Figure 6.3,...Ch. 6 - Two genes are located on the same chromosome and...Ch. 6 - 9. Two genes, designated A and B, are locatedfrom...Ch. 6 - 10. Two genes in tomatoes areapart; normal fruit...Ch. 6 - In the tomato, three genes are linked on the same...Ch. 6 - A trait in garden peas involves the curling of...Ch. 6 - Prob. 13EQCh. 6 - 14. In the garden pea, several different genes...Ch. 6 - A sex-influenced trait is dominant in males and...Ch. 6 - Three recessive traits in garden pea plants are as...Ch. 6 - In mice, a trait called snubnose is recessive to a...Ch. 6 - 18. In Drosophila, an allele causing vestigial...Ch. 6 - 19. Three autosomal genes are linked along the...Ch. 6 - 20. Let’s suppose that two different X-linked...Ch. 6 - Prob. 21EQCh. 6 - In mice, a dominant allele that causes a short...Ch. 6 - 2. In Chapter 3, we discussed the idea that the X...Ch. 6 - Mendel studied seven traits in pea plants, and the...
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Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, biology and related others by exploring similar questions and additional content below.Similar questions
- How would one explain a testcross involving F1 dihybrid flies in which more parental-type offspring than recombinant-type offspring are produced? Group of answer choices A. The testcross was improperly performed B. The two genes are linked C. Both of the characters are controlled by more than one gene D. The two genes are linked but on different chromosomes E. Recombination did not occur in the cell during meiosisarrow_forwardFruit flies are very useful model organisms that have been used to study genetics. One mutant recessive trait in fruit flies is called "eyeless" because it causes flies to have no eyes. Cross an eyeless fly with a homozygous normal fly. a. Draw the Punnett square. b. What is the genotyoe ratio of the offspring? c. What is the phenotype ratio of the offspring? d. What genetic problem is this? (monohybrid, dihybrid or multiple allele)arrow_forwardA fungus with white spores cross fertilizes a fungus with black spores. If 10% of the progeny bear white spores while 90% of the progeny bear black spores, what must be true? A. The trait for spore color is determined by exactly one gene. B. The trait for spore color is determined by more than one gene. C. The allele for black spores is dominant over that for white spores. D. The allele for white spores is dominant over that for black spores. Photo attatchedarrow_forward
- Which of the following statements accurately represents the difference between a gene and a locus? a. A gene is dominant, and a locus is recessive. b. A locus and a gene are essentially the same - there is no difference. c. A locus occurs in diploid cells, and a gene occurs in a haploid cell. d. A locus is a phenotype and a gene is a genotype.arrow_forwardGenes exist in pairs in individuals; during the production of gametes, the pairs are separated so that a gamete has only one of each kind. This is known as which of the following? Group of answer choices A-mitosis B-the principle of segregation C-nondisjunction D-recombination E-principle of independent assortmentarrow_forwardIn the lab, you discover two yeast haploid mutants that cannot produce arginine. You cross them together and the resulting diploid produces arginine. If producing arginine is the wild type phenotype, what can you definitively conclude? A.The haploid strains have identical mutations in the same genes. B.The haploid strains have identical mutations in different genes. C.The haploid strains have mutations in different genes. D.The haploid strains have mutations in the same gene. E.The haploid strains must belong to the complementation group encoding the first enzyme in the biosynthetic pathway.arrow_forward
- Which of the following best describes a pair of homologous chromosomes? a- A pair of chromosomes that have the same alleles of the same genes arranged in the same order b- A pair of chromosomes that have the same genes, but arranged in a different order, and with potentially different alleles of some of the genes c- A pair of chromosomes that have different alleles of the same genes arranged in different order d- A pair of chromosomes that have the same genes in the same order, but possibly with different alleles of some of the genesarrow_forwardBased on the ideas proposed by Morgan, which of the followingstatements concerning linkage is not true?a. Traits determined by genes located on the same chromosome arelikely to be inherited together.b. Crossing over between homologous chromosomes can create newallele combinations.c. A crossover is more likely to occur in a region between two genesthat are close together than in a region between two genes that arefarther apart.d. The probability of crossing over depends on the distance betweenthe genes.e. Genes that tend to be transmitted together are physically located onthe same chromosomearrow_forwardIn linkage mapping, how do we measure the distance between genes on a chromosome? options: A) The number of gametes used is proportional to the percent recombination in offspring. B) The number of offspring produced is equal to the percent recombination during crossover. C) The number of chromosomes resulting from crossover is equal to the distance the genes are apart in any one gamete. D) The percentage of recombinant offspring is directly proportional to how far apart the genes are on the chromosome.arrow_forward
- You perform a cross between two plants, one MmPp and one mmpp, and obtain offspring with the following phenotypes: 42 MP; 374 Mp; 367 mP; 27 mp. What can you conclude from these data? Group of answer choices The M and P genes are on different chromosomes The recombinant progeny are mP and Mp The M and P genes are far apart on the same chromosome The recombinant progeny are MP and mparrow_forwardFigure 4 shows the hybridization process between plant P and Q. a) Determine the sterile hybrid plant and the fertile hybrid plant. b) What is process A? c) State the chromosome number for the fertile hybrid plant.arrow_forwardLocus heterogeneity means that a genetic disordera. has a heterogeneous phenotype.b. is caused by mutations in two or more different genes.c. involves a structural change in multiple chromosomes.d. is inherited from both parentsarrow_forward
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