Genetics: Analysis and Principles
6th Edition
ISBN: 9781259616020
Author: Robert J. Brooker Professor Dr.
Publisher: McGraw-Hill Education
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Chapter 4, Problem 9EQ
Summer squash exist in long, spherical, or disk shapes. When a true-breeding long-shaped strain was crossed to a true-breeding disk-shaped strain, all of the
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Three fruit shapes are recognized in the summer squash (Cucurbita pepo): disk-shaped, elongated, and sphere shaped. A pure disk-shaped variety was crossed to a pure elongated variety. The F1 were all disk-shaped. Among 80 F2 there were 30 sphere-shaped, 5 elongated, and 45 disk-shaped. Keeping in mind this gene interaction, what phenotypic proportions are expected in the progeny of the sphere-shaped in F2 when crossed at random?
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Chapter 4 Solutions
Genetics: Analysis and Principles
Ch. 4.1 - 1. Which of the following statements is true?
a....Ch. 4.2 - 1. Which of the following is not an example of a...Ch. 4.2 - Prob. 2COMQCh. 4.2 - 3. Polydactyly is a condition in which a person...Ch. 4.3 - The outcome of an individuals traits is controlled...Ch. 4.4 - Prob. 1COMQCh. 4.4 - Prob. 2COMQCh. 4.5 - Prob. 1COMQCh. 4.5 - Hemophilia is a blood-clotting disorder in humans...Ch. 4.6 - Prob. 1COMQ
Ch. 4.7 - 1. The Manx phenotype in cats is caused by a...Ch. 4.8 - Which of the following is a possible explanation...Ch. 4.9 - 1. Two different strains of sweet peas are...Ch. 4.9 - If the F1 offspring from question 1 are allowed to...Ch. 4 - 1. Describe the differences among dominance,...Ch. 4 - Discuss the differences among sex-influenced,...Ch. 4 - 3. What is meant by a gene interaction? How can a...Ch. 4 - Lets suppose a recessive allele encodes a...Ch. 4 - 5. A nectarine is a peach without the fuzz. The...Ch. 4 - 6. An allele in Drosophila produces a star-eye...Ch. 4 - A seed dealer wants to sell four-oclock seeds that...Ch. 4 - 8. The blood serum from one individual (let’s call...Ch. 4 - 9. Which blood type phenotypes (A, B, AB, and/or...Ch. 4 - A woman with type B blood has a child with type O...Ch. 4 - A type A woman is the daughter of a type O father...Ch. 4 - In Shorthorn cattle, coat color is controlled by a...Ch. 4 - In chickens, the Leghorn variety has white...Ch. 4 - Propose the most likely mode of inheritance...Ch. 4 - 15. A human disease known as vitamin D-resistant...Ch. 4 - 16. Hemophilia is an X-linked recessive trait in...Ch. 4 - 17. Incontinentia pigmenti, a rare, X-linked...Ch. 4 - 18. Scurs in cattle is a sex-influenced trait. A...Ch. 4 - In rabbits, the color of body fat is controlled by...Ch. 4 - Prob. 20CONQCh. 4 - 21. The trait of feathering in fowls is a...Ch. 4 - Based on the pedigree shown here for a trait...Ch. 4 - 23. The pedigree shown here involves a trait...Ch. 4 - Lets suppose you have pedigree data from thousands...Ch. 4 - Prob. 25CONQCh. 4 - 26. In humans, a very rare dominant allele that...Ch. 4 - 27. A sex-influenced trait in humans affects the...Ch. 4 - Three coat-color patterns that occur in some...Ch. 4 - Prob. 1EQCh. 4 - 2. In chickens, some varieties have feathered...Ch. 4 - 3. In sheep, the formation of horns is a...Ch. 4 - Prob. 4EQCh. 4 - In the clover butterfly, males are always yellow,...Ch. 4 - The Mic2 gene in humans is present on both the X...Ch. 4 - 7. Duroc Jersey pigs are typically red, but a...Ch. 4 - 8. As shown in Figure 4.17, coat color in rodents...Ch. 4 - 9. Summer squash exist in long, spherical, or disk...Ch. 4 - In a species of plant, two genes control flower...Ch. 4 - 11. Red eyes is the wild-type phenotype in...Ch. 4 - 12. As mentioned in Experimental Question E11, red...Ch. 4 - Lets suppose you were looking through a vial of...Ch. 4 - 14. When examining a human pedigree, what features...Ch. 4 - Lets suppose a gene exists as a functional...Ch. 4 - In oats, the color of the chaff is determined by a...
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- Individuals of genotype AaBb were mated to individuals of genotype aabb. One thousand offspring were counted, with the following results: 474 Aabb, 480 aaBb, 20 AaBb, and 26 aabb. What type of cross is it? Are these loci linked? What are the two parental classes and the two recombinant classes of offspring? What is the percentage of recombination between these two loci? How many map units apart are they?arrow_forwardIn pea plants, yellow seeds (Y) are dominant to green seeds (y) and round seeds (R) are dominant to wrinkled seeds (). The genes for seed color and seed shape are on different chromosomes. Two true-breeding parents, one with yellow round peas and the other with green wrinkled peas, are crossed to produce a hybrid (heterozygous) F₁. Two F₁ individuals are crossed to give an F2; this is depicted in the Punnett square below. Place the correct genotypes in the Punnett square and the place the correct phenotypic ratios next to their appropriate phenotype on the right. YYRR YYRr YyRR YYrr yyRR yyRr Yyrr YyRr 3/16 1/16 yyrr 9/16 3/16 1/4 E 1/2 16/16 YR ✪✪✪ Yr yR YYRR Y YyRr Yr yR YR YYRr YYRR YyRr yr YyRr yyrr yr YyRr Yyrr yyRr F2 phenotype Phenotypic ratio Aarrow_forwardA snapdragon plant that bred true for white petals was crossed to a plant that bred true for purple petals and all the F1 have white petals. The F1 was selfed. Among the F2 three phenotypes were observed in the following numbers: White--> 240 Solid Purple --> 61 Spotted Purple --> 19 a) Propose the correct genetic explanation for this phenomenon. Define your genetic symbols and show the genotypes of the Parentals, F1, and F2 individuals above. You may use underscores ( _ ) where appropriate. Please clearly label your answer. b) Complete a chi square to defend your answer. Be sure to include chi, Ho and Ha. Do not forget to interpret your test.arrow_forward
- A pure breeding strain of squash that produced disk-shaped fruits was crossed with a pure- breeding strain having long fruits. The first filial generation had disk fruits, but the second filial generation showed a new phenotype, sphere, and was composed of the following proportions: disk 270, sphere 178, long 32. Propose an explanation for these results, and show the genotypes of P, First filial generation and second filial generation.arrow_forwardA type of tomato (Solanum lycopersicum) produces fruit in three possible colors: red, orange, and green. You cross a true-breeding red-fruited plant with a true-breeding green-fruited plant, and all the F1 offspring are red. You intercross the red F1s, and the resulting F2 generation consists of 61 red-, 13 orange-, and 6 green-fruited plants. a) Assign the phenotypes to a modified 9:3:3:1 ratio (do not just calculate the actual ratio of the phenotypes). Show your work.arrow_forwardYou have two true-breeding strains of coneflower. One strain has purple flowers and purple stems. The other strain has white flowers and green stems. When you cross these strains the F1 generation has purple flowers and purple stems. From this information you know that purple flowers is dominant to white flowers and that purple stems is dominant to green stems. In terms of genetic mechanisms, there could be two explanations: (1) flower color and stem color are each controlled by separate, independently segregating genes, and (2) there is one gene controlling both flower color and stem color. A. If explanation #1 is correct what would you see if the F1 generation were self-crossed to produce an F2 generation. Make up appropriate genetic symbols for this model and work out the cross to the F2 generation. B. If explanation #2 is correct what would you see if the F1 generation were self-crossed to produce an F2 generation. Make up appropriate genetic symbols for this model and work out the…arrow_forward
- In roses, purple flower color is determined by the dominant P allele, while pp homozygotes are white. The presence of long stems is determined by the dominant S allele, while ss homozygotes have short stems. Both mutations are completely penetrant. A test cross was performed between a rose plant of unknown genotype with a white flowered, short stemmed rose plant (pp ss) and the following 200 progeny plants were obtained: 84 white flowers, long stems 16 purple flowers, long stems 82 purple flowers, short stems 18 white flowers, short stems Select the statements below that are TRUE. Select 2 correct answer(s) The P and S genes independently assort during meiosis. The map distance between P and S is 17 CM. The genotype of the progeny plants with purple flowers and short stems is PP ss. The map distance between P and S is 83 CM. The homologs in the plant with unknown genotype are p S and Ps. The homologs in the plant with unknown genotype are PS and p s.arrow_forwardIn corn, seedling color is determined by genes at two loci (C/c and D/d). Suppose that you cross a pure-breeding green seedling with a pure-breeding yellow seedling and obtain only green seedlings in the F1 generation. You then cross two of the F1 seedlings and obtain the following progeny for the F2 generation: 138 green seedlings, 33 virescent-white seedlings, and 10 yellow seedlings. What form of epistasis would explain these data?arrow_forwardMendelian ratios are modified in crosses involving autotetraploids.Assume that one plant expresses the dominant trait greenseeds and is homozygous (WWWW). This plant is crossed to onewith white seeds that is also homozygous (wwww). If only onedominant allele is sufficient to produce green seeds, predict theF1 and F2 results of such a cross. Assume that synapsis betweenchromosome pairs is random during meiosis.arrow_forward
- In cucumbers, speckled fruit color (u') is dominant to uniform fruit color (u), and large spines (ss") are dominant to small spines (ss). These two genes are linked at a map distance of 20.4 m.u. A true-breeding cucumber plant with speckled fruit and large spines is crossed with a true-breeding plant with uniform fruit color and small spines. One of the F1 plants is crossed with a plant with uniform fruit color and small spines. What percentage of the offspring of this cross are expected to have uniform fruit color and small spines? 39.8% 10.2% 79.6% 20.4%arrow_forwardYou carry out a trihybrid cross (a cross in which the parental plants differ for three characters) between a tall pea plant with round, yellow seeds (TT RR YY) and a short pea plant with wrinkled, green seeds (tt rr yy). The parental plants are homozygous for all of the three characters. They are crossed to produce the F1 generation. Tall, round, and yellow are the dominant traits for each character. What will be the phenotypes of the F1 generation?arrow_forwardPurebred wrinkled, green-seeded pea plants were crossed with purebred round, yellow-seeded plants. The F1, all of which had round and yellow seeds, were then self-crossed resulting in the following F2: 172 plants with round and yellow seeds, 55 plants with round and green seeds, 58 plants with wrinkled and yellow seeds, and 15 plants with wrinkled and green seeds. Calculate the chi-square value and determine the p-value range. Which of the following are the correct chi-square values, p-value range, and whether you would accept or reject the hypothesis that these results are consistent with Mendelian predictions?arrow_forward
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