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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Fragile X is a disorder which causes mental impairment in affected individuals. The trait which is due to a mutation in the FMR1 gene on the X chromosome is inherited in a recessive manner. An unaffected son was born to an affected man and an unaffected woman. The woman’s mother was affected while the father was normal. a. Indicate the gene notation. b. Give the genotype of the son. c. Is it possible for the couple to have an affected daughter? affected son? Derive the genotypic and phenotypic ratios for the offspring. Show and label your solutions properly. d. If the couple has four children, what is the probability that they will have three normal daughters and one normal son?
Locus heterogeneity refers to a genetic disorder thata. 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 parents.
Which of the following statements about genes is TRUE?
a. Alleles of genes located on the same chromosome may assort independently.
b. Alleles of genes on the same chromosome always fail to assort independently.
c. Linked genes are located on the same chromosome.
d. a and c, but not b
e. b and c, but not a
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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- Which of the following best describes the concept of independent assortment? Group of answer choices a. 2n, where n = number of chromosomes b. Gametes receive one of each chromosome pair but which chromosome it receives is decided randomly c. Refers to the Mendelian genetics d. Independent assortment always occurs at prophase 2 in eukaryotic organisms. e. Is the process of specified segregation and assortment of chromosomes in an organism.arrow_forwardWhich 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_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
- Step 3: Compare the Parentals with the Double Cross Overs (DCO) to determine the correct order of the genes along the chromosome. A. List the alleles on the chromosome diagrams below. Parentals DCO B. Which single gene allele pair in the double cross over if exchanged would make the double cross over chromosomes be exactly like the Parentals? C. Reorder the alleles on the Parental chromosomes so that the gene allele pair in part B is in the middle. Check the order, by creating a double cross over of the Parental chromosomes. If alleles combination (not order) matches the DCO then you correctly determined which gene is in the middle for the chromosome map. Parentals Step 4: Rewrite all the gene orders in Step 2 in the space below with the correct gene in the middle.arrow_forwardAs 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? a. The alleles of the genes in question did not go through independent assortment b. The genes in question are likely located on different chromosomes c. There is a 100% frequency of recombination in this test cross d. Most of the test cross offspring look like their parentsarrow_forward#6: You are a young haploid male Honeybee. What is the probability that a gene in your genome is also in the genome of your diploid mother, the Queen?A. 50%B. 100%C. 25%D. 75%E. 0% (you have no mother)arrow_forward
- In the diagram in the box below the horizontal line represents a chromosome and A, B, C, D and E represent the position of genes on the chromosome. You would expect the highest frequency of recombination of genes to occur between? A BC D E Lll S a) Between genes B and D b) Between genes B and C c) Between genes A and B d) Between genes A and Carrow_forwardExamine the image showing the locations of four different genes on a chromosome. a b C ABC d D Aldona Griskeviciene/Shutterstock. Modified by StrangMind. Long Description Which of the following would be expected from breeding experiments involving these genes? Select all that apply. Genes A and B show strong linkage, but genes C and D show little to no linkage. Genes B and C show strong linkage, but genes A and B show little to no linkage. More genetic recombinants would be observed for genes A and D than for genes B and C. More genetic recombinants would be observed for genes A and C than for genes A and D.arrow_forwardWhich of the following is correct regarding polytene chromosomes? options: A. Exposure to a sublethal dose of X-rays causes spontaneous mutations. B. Polytene chromosomes have been useful to observe specific bands correlated with individual genes. C. Both A and B D. None of the abovearrow_forward
- What can you assert regarding cytoplasmic inherited traits? A. extensive phenotypic variation exhibited, even within a single family B. reciprocal crosses that give different results C. All of the answers are correct. D. usually inherited from one parent, typically the maternal parent E. present in both males and femalesarrow_forwardIn 95% of cases of Down's syndrome, there is an entire extra chromosome 21 in every cell. This aneuploid condition is the result of A. Improper crossing over. B. Independent assortment. C. Nondisjunction. D. All are correct.arrow_forwardExamination of a karyotype reveals 23 pairs of chromosomes, with each homologous pair illustrating similar size and centromere location. Which of the following can be concluded from this karyotype?a. The individual has Down syndrome.b. The individual is a female.c. The individual does not have cystic fibrosis.d. The individual does not have sickle-cell anemia.arrow_forward
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