Essentials of Genetics
9th Edition
ISBN: 9781292108933
Author: KLUG
Publisher: PEARSON
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Chapter 6, Problem 3CS
CASE STUDY |Fish tales
Aquatic vegetation overgrowth, usually controlled by dredging or herbicides, represents a significant issue in maintaining private and public waterways. In 1963, diploid grass carp were introduced in Arkansas to consume vegetation, but they reproduced prodigiously and spread to eventually become a hazard to aquatic ecosystems in 35 states. In the 1980s, many states adopted triploid grass carp as an alternative because of their high, but not absolute, sterility and their longevity of seven to ten years. Today, most states require permits for vegetation control by triploid carp, requiring their containment in the body of water to which they are introduced. Genetic modifications of organisms to achieve specific outcomes will certainly become more common in the future and raise several interesting questions.
Why would the creation and use of a tetraploid carp species be less desirable in the above situation?
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Progeny of triploid tomato plants often contain parts of an extra chromosome, in addition to the normal complement of 24 chromosomes . Mutantswith a part of an extra chromosome are referred to as secondaries. James and Margaret Lesley observed that secondaries arise from triploid (3 n), trisomic (3 n + 1), and double trisomic (3 n + 1 + 1) parents, but never from diploids (2 n). Give one or more possible reasons that secondaries arise from parents that have unpaired chromosomes but not from parents that are normal diploids.
211 Inheritance 2. The pedigree chart below illustrates the inheritance of a trait (darker symbols) in two families joined in marriage. 2 4 6 8. 10 11 12 13 14 II 4 5 (a) State whether the trait is dominant or recessive, providing a reason for your choice: (b) State whether the trait is sex-linked or not, providing a reason for your choice: 3. The recessive sex-linked gene (h) prolongs the blood-clotting time, resulting in the genetically inherited disease called hemophilia. From the information in the pedigree chart (right), answer the following questions: Hemophilia in humans (a) If 112 marries a normal man, what is the probability of her first child being a hemophiliac? 1 (b) Suppose her first child is actually a hemophiliac. What is the chance that her second child will be a boy with hemophilia? 4 (c) If 114 has children with a hemophiliac man, what is the probability that her first child will be phenotypically normal? (d) If the mother of 12 was phenotypically normal, what…
F2 plants segregate colored : colorless. If acolored plant is picked at random and selfed, what is theprobability that both colored and colorless plants will beseen among a large number of its progeny?
Please solve with step by step please
Chapter 6 Solutions
Essentials of Genetics
Ch. 6 - CASE STUDY| Fish tales Aquatic vegetation...Ch. 6 - CASE STUDY |Fish tales Aquatic vegetation...Ch. 6 - CASE STUDY |Fish tales
Aquatic vegetation...Ch. 6 - HOW DO WE KNOW? In this chapter, we focused on...Ch. 6 -
CONCEPT QUESTION
2. Review the Chapter Concepts...Ch. 6 -
3. Define these pairs of terms, and distinguish...Ch. 6 -
4. For a species with a diploid number of 18,...Ch. 6 - What explanation has been proposed to explain why...Ch. 6 - Contrast the fertility of an allotetraploid with...Ch. 6 -
7. Why do human monosomies most often fail to...
Ch. 6 -
8. Describe the origin of cultivated American...Ch. 6 - Predict how the synaptic configurations of...Ch. 6 - Inversions are said to “suppress crossing over.”...Ch. 6 -
11. Predict the genetic composition of gametes...Ch. 6 - Human adult hemoglobin is a tetramer containing...Ch. 6 -
13. The primrose, Primula kewensis, has 36...Ch. 6 - Certain varieties of chrysanthemums contain 18,...Ch. 6 - Drosophila may be monosomic for chromosome 4, yet...Ch. 6 - Mendelian ratios are modified in crosses involving...Ch. 6 -
17. Having correctly established the F2 ratio in...Ch. 6 -
18. In a cross between two varieties of corn,...Ch. 6 -
19. A couple planning their family are aware that...Ch. 6 -
20. A woman who sought genetic counseling is...Ch. 6 - The woman in Problem 20 has had two miscarriages....Ch. 6 -
22. In a recent cytogenetic study on 1021 cases...Ch. 6 -
23. A boy with Klinefelter syndrome (47,XXY) is...Ch. 6 - In a human genetic study, a family with five...Ch. 6 - A 3-year-old child exhibited some early indication...Ch. 6 - A normal female is discovered with 45 chromosomes,...
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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
- 1. Assume that figure (A) represents a normal karyotype of this animal. What is the diploid number of thisanimal? 2.Cell (A) contains 3.1 billion (3.1 x 109) base pairs of DNA. Each nucleosome has about 200 bp of DNAwrapped around the histone core.a. What is the maximum number of nucleosomes that can be present in the cell?b. What is the maximum number of H2A histone protein molecules that can be present in the cell?arrow_forwardGENETICS Question; 1. Give the genotypes and its ratio of the dihybrid cross of FIGURE 7. Regarding this problem, you may refer the genotype of the monohybrid cross of pea flower color in Figure 6.arrow_forwardProblem Solving: In Drosophila, the gene that controls red eye color (dominant) versus white eye color is on the X chromosomes. What are the expected phenotypic results if a heterozygous female is crossed with a white-eyed male? In cats, S = short hair; s = long hair; XC = black coat; Xc = yellow coat; XCXc = tortoiseshell (calico) coat. If a long-haired yellow male is crossed with a tortoiseshell female homozygous for short hair, what are the expected phenotypic results?arrow_forward
- Controlling the overgrowth of invasive aquatic vegetation is asignificant problem in the waterways of most U.S. states.Originally, herbicides and dredging were used for control, butin 1963, diploid Asian carp were introduced in Alabama and Arkansas.Unfortunately, through escapes and illegal introductions, the carpspread rapidly and became serious threats to aquatic ecosystems in45 states. Beginning in 1983, many states began using triploid, sterilegrass carp as an alternative, because of their inability to reproduce,their longevity, and their voracious appetite. On the other hand, thisgenetically modified exotic species, if not used properly, can reduceor eliminate desirable plants and outcompete native fish, causing moredamage than good. The use of one exotic species to control otherexotic species has had a problematic history across the globe, generatingcontroversy and criticism. Newer methods for genetic modificationof organisms to achieve specific outcomes will certainly becomemore…arrow_forwardControlling the overgrowth of invasive aquatic vegetation is asignificant problem in the waterways of most U.S. states.Originally, herbicides and dredging were used for control, butin 1963, diploid Asian carp were introduced in Alabama and Arkansas.Unfortunately, through escapes and illegal introductions, the carpspread rapidly and became serious threats to aquatic ecosystems in45 states. Beginning in 1983, many states began using triploid, sterilegrass carp as an alternative, because of their inability to reproduce,their longevity, and their voracious appetite. On the other hand, thisgenetically modified exotic species, if not used properly, can reduceor eliminate desirable plants and outcompete native fish, causing moredamage than good. The use of one exotic species to control otherexotic species has had a problematic history across the globe, generatingcontroversy and criticism. Newer methods for genetic modificationof organisms to achieve specific outcomes will certainly becomemore…arrow_forwardBackground Info Rainbow trout go through a unique genetic reproductive process. Female eggs are diploid, while male sperm are haploid. In the wild, when the sperm fertilizes an egg, the extra set of chromosomes is kicked out, resulting in a diploid offspring.Triploid trout are produced in the lab to provide sterile fish stock for lakes. Shortly after the eggs are fertilized, scientists place them in a warm water bath to prevent the extra chromosomes from being removed. The result is a triploid fish that cannot reproduce.Rainbow Trout: n = 30 Global warming is an issue affecting many species around the world. Warming has caused the temperatures in lakes and rivers to increase and stay elevated for longer periods of time. Question Select the FOUR numbers that describe the possible effects of global warming on the reproduction of rainbow trout in the wild and on biodiversity. The extra set of chromosomes remains. The extra set of chromosomes is removed. The offspring are diploid (2n).…arrow_forward
- Another gene in Drosophila determines wing length. The dominant wild-type allele of this gene produces long wings; a recessive allele produces vestigial (short) wings. A female that is true- breeding for red eyes and long wings is mated with a male that has purple eyes and vestigial wings. F1 females are then crossed with purple-eyed, vestigial-winged males. From this second cross, a total of 600 offspring are obtained with the following combinations of traits: 252 with red eyes and long wings 276 with purple eyes and vestigial wings 42 with red eyes and vestigial wings 30 with purple eyes and long wings Are the genes linked, unlinked, or sex-linked? If they are linked, how many map units separate them on the chromosome?arrow_forwardSome recessive alleles have such a detrimental effect that they are lethal when present in both chromosomes of a pair. Homozygous recessives cannot survive and die at some point during embryonic development. Suppose that the allele r is lethal in the homozygous rr condition. What genotypic ratios would you expect among the living offspring of the following crosses? a. RRRr b. RrRrarrow_forwardA heterozygous pea plant produces violet flowers and yellow, round seeds. Describe the expected genotypes of the gametes produced by Mendelian inheritance. If all three genes are found on the same arm of one chromosome should a scientist predict that inheritance patterns will follow Mendelian genetics?arrow_forward
- In sweet pea plants, an allele for purple flowers. (P) is dominanl when paired with a recessive allele for red flowers (p). An allele for Jang pollen grains (L) is dominant when paired with a recessive allele for round pollen grains (L). Bateson and Punnett crossed a plant having purple flowers and long pollen grains with one having white flowers and round pollen grains. All F1 offspring have purple flowers and long pollen grains. Among the F2 generation, the researchers observed the following phenotypes: 296 purple flowers/long pollen grains 19 purple /lower/ round pollen grains 27 red flowers/long pollen grains 85 red flowers/round pollen grains What is the best explanation for these results?arrow_forwardThe gene for flower position in pea plants exists as axial or terminal alleles. Given that axial is dominant to terminal, list all of the possible F1 and F2 genotypes and phenotypes from a cross involving parents that are homozygous for each trait. Express genotypes with conventional genetic abbreviations.arrow_forwardAssuming no gene linkage, in a dihybrid cross of AABB x aabb with AaBb F1 heterozygotes, what is the ratio of the F1 gametes (AB, aB, Ab, ab) that will give rise to the F2 offspring? a. 1:1:1:1 b. 1:3:3:1 c. 1:2:2:1 d. 4:3:3:1arrow_forward
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