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 2COMQ
In the experiment by Bateson and Punnett, which of the following observations suggested genetic linkage in the sweet pea?
a. A 9:3:3:1 ratio was observed in the
b. A 9:3:3:1 ratio was not observed in the
c. An unusually high number of
d. Both b and c suggested linkage.
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Students have asked these similar questions
Gregor Mendel observed that some traits in his peas would disappear in the F1 generation but would then reappear in the next (F2) generation. He then proposed that
A.
new mutations were frequently generated in the F2 progeny, "reinventing" traits that had been lost in the F1.
B.
members of the F1 generation had only one allele for each character, but members of the F2 had two alleles for each character.
C.
the mechanism controlling the appearance of traits was different between the F1 and the F2 plants.
D.
this reappearance of the trait was due to dominance of an inherited factor over another.
E.
this was caused by a mutation that resulted in a dysfunctional protein being encoded by one of the two gene copies.
A cross between two pea plants with genotypes PpLI and PpLI results in an F1 generation that is 25% PPLL, 50% PpLI, and 25% ppll. Which reason most likely explains why other possible genotypes are not present?
Choose 1 answer.
A.The genes underwent independent assortment
B.The loci of the genes are close together.
C.The loci of the genes are on different chromosomes.
D.Crossing over occurred between chromosomes.
How can the order of three linked genes (A, B, and C) on the same chromosome be determined?
A.
Calculating the frequency of recombination between genes.
B.
Gene order cannot be determined by looking at the results of a cross.
C.
Look for parental phenotypes.
D.
Look for single-crossover phenotypes involving the wild-type and mutant alleles of genes A, B, and C.
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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- For a chi square analysis involving genes that may be linked,which of the following statements is correct?a. An independent assortment hypothesis is not proposedbecause the data usually suggest linkage.b. An independent assortment hypothesis is proposed becauseit allows the expected numbers of offspring to be calculated.c. A large chi square value suggests that the observed andexpected data are in good agreement.d. The null hypothesis is rejected when the chi square value isvery low.arrow_forwardIn fruit flies, long wings (L) are dominant over short wings (l). LL, Ll, and ll represent Select one: a. Three dominants b. Three phenotypes c. Three genotypes d. Three true breeding crossesarrow_forwardA true breeding plant that produces elongated fruits is crossed to a true breeding plant that produces round fruits. The offspring of this cross all have oval-shaped fruit. Which of the following is true? A. This involves two genes, one that controls the length of the fruit and one that controls the width. B. This long allele is epistatic over the short allele. C. The long allele is dominant over the short allele. D. The long allele is incompletely dominant over the short allele.arrow_forward
- You are doing a genetics experiment with the fruit fly. In the “P” generation, you cross two true-breeding flies. The female parent is brown and wingless and the male parent is black with normal wings. All of the flies in the F1 generation are brown and have normal wings. Answer all the questions below. 3a. What is the genotypes of P generation? 3b. What is the genotype of the F1 generation? 3c. You now take an F1 female and cross her to a true-breeding black, wingless male so what is the male’s genotype? 3d. You count 1600 offspring in the F2 generation. If the wing and the color traits were linked and no recombination occurred, what would you expect the numbers of: 1. brown winged flies (BbNn) 2. black winged flies (Bbnn) 3. brown wingless flies (bbNn) 4. black wingless flies (bbnn). 3e. What is the genetic distance between the color and wing genes when you count the F2 generation as 85 brown winged flies, 728 black winged flies, 712 brown wingless flies, and 75 black wingless flies.arrow_forwardIn garden pea plants, the purple flower colour (P) is dominant over the white flower colour (p). What are the phenotypes of homozygous dominant and heterozygous flowers, respectively? Select one: a. Purple and purple b. White and white c. Purple and white d. White and purplearrow_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_forward
- A gene for corn has two alleles, one for yellow kernels and one for white kernels. Cross pollination of yellow corn and white corn results in ears of corn that have an approximately even mix of yellow and white kernels. Which term best describes the relationship between the two alleles? Choose 1 answer: A. Genetic recombination B. Codominance C. Incomplete dominance D.Chimerismarrow_forwardSasha crossed a plant with a yellow seed (YY) with a plant with green seed (yy). The F2 generation yielded 12 200 yellow seeded plants and 4150 green-seeded plants. From this experiment Sasha proposed the Law of A.) Segregation B.) Mutation C.) Independent assortment D.) Codominacearrow_forwardWhat is the difference between a monohybrid cross and a dihybrid cross? A. A monohybrid cross involves a single parent, whereas a dihybrid cross involves two parents. B. A monohybrid cross produces a single progeny, whereas a dihybrid cross produces two progeny. C. A monohybrid cross involves organisms that are heterozygous for a single trait, whereas a dihybrid cross involves organisms that are heterozygous for two traits. D. A monohybrid cross is performed only once, whereas a dihybrid cross is performed twice.arrow_forward
- Imagine you cross two closely related plant varieties: Maize and teosinte. You hypothesize that different alleles at just 5 genes are responsible for all the trait differences between the two plants. You take two inbred parent lines and cross them together to produce an F1 and then cross two F1 individuals together to produce F2 offspring. What proportion of the offspring do you expect to look exactly like each of the parent lines if your hypothesis is correct? Please show work using punnet squares.arrow_forwardYou come across a pea plant with yellow round peas but you aren't sure about it's genotype. 1. a. What are all the possible genotypes this plant could have? I b. In order to determine which genotype is correct you could do a test cross. Use one of the genotypes from 'a' and write out a test cross and the predicted progeny. C. Use another of the genotypes from 'a' and write out a test cross and the predicted progeny, clearly indicating how the progeny would be different and in different proportions depending on the genotype from 'a'.arrow_forwardWhat does a Punnett square illustrate? A. The phenotypes of all offspring in a test cross. B. The genotypes of all possible offspring in a test cross. C. The phenotypes of all possible offspring in a test cross. D. The genotypes and phenotypes of all possible offspring in a test cross.arrow_forward
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