18. In tomatoes, tall (D) is dominant over dwarf (d), and smooth fruit (P) is dominant over pubescent (p) fruit, which is covered with fine hairs. A farmer has two tall and smooth tomato plants, which we will call plant A and plant B. The farmer crosses plants A and B with the same dwarf and pubescent plant and obtains the following numbers of progeny: Dd Pp Dd pp dd Pp dd pp Progeny of Plant A 122 6 4 124 a. What are the genotypes of plant A and plant B? Indicate what are the alleles on each chromosome Plant B 2 82 82 4 b. Are the loci that determine height of the plant and pubescence linked? If so, what is the percent recombination between them? Use chi-square test: 1) what is your hypothesis; 2) what are the expected results based on your hypothesis; 3) how to calculate chi-square; 4) what is the degree of freedom; 5) what is the p-value, and 6) what is your conclusion (what does the p-value mean) If these two genes are linked, calculate the recombinant frequency. c. Explain why different proportions of progeny are produced when plant A and plant B are crossed with the same dwarf pubescent plant.

18. In tomatoes, tall (D) is dominant over dwarf (d), and smooth fruit (P) is dominant over pubescent (p) fruit, which is covered with fine hairs. A farmer has two tall and smooth tomato plants, which we will call plant A and plant B. The farmer crosses plants A and B with the same dwarf and pubescent plant and obtains the following numbers of progeny: Dd Pp Dd pp dd Pp dd pp Progeny of Plant A 122 6 4 124 a. What are the genotypes of plant A and plant B? Indicate what are the alleles on each chromosome Plant B 2 82 82 4 b. Are the loci that determine height of the plant and pubescence linked? If so, what is the percent recombination between them? Use chi-square test: 1) what is your hypothesis; 2) what are the expected results based on your hypothesis; 3) how to calculate chi-square; 4) what is the degree of freedom; 5) what is the p-value, and 6) what is your conclusion (what does the p-value mean) If these two genes are linked, calculate the recombinant frequency. c. Explain why different proportions of progeny are produced when plant A and plant B are crossed with the same dwarf pubescent plant.

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Description: 18. In tomatoes, tall (D) is dominant over dwarf (d), and smooth fruit (P) is dominant overpubescent (p) fruit, which is covered with fine hairs. A farmer has two tall and smoothtomato plants, which we will call plant A and plant B. The farmer cross

Biology: The Dynamic Science (MindTap Course List)

4th Edition

ISBN:9781305389892

Author:Peter J. Russell, Paul E. Hertz, Beverly McMillan

Publisher:Peter J. Russell, Paul E. Hertz, Beverly McMillan

Chapter12: Mendel, Genes, And Inheritance

Section: Chapter Questions

Problem 1TYK: The dominant C allele of a gene that controls color in corn produces kernels with color; plants...

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2. Show a dihybrid cross of a plant with a genotype of heterozygous green leaf and heterozygous smooth leaf blade and another plant with a genotype of homozygous green leaf and homozygous serrated leaf blade. Consider green (WW) is dominant over white (ww) while smooth (SS) is dominant over serrated (ss). What are the possible offspring from this cross? Give the phenotype, genotype and their ratio. Make sure the phenotype and genotype were aligned with its ratio.
9. Given the following information on corn phenotypes, particularly for the heterozygote, C sh Wx Sh Wx Where: c = colored endosperm Sh = shrunken WX = waxy Predict the resulting gametes formed after crossing over. a. sh Wx Sh WX b. С sh Wx Sh WX c. C sh Wx ShWx
1. Fine spines (s), smooth fruit (tu) and uniform fruit color (u) are three recessive traits in cucumbers, the genes for which are linked on the same chromosome. A cucumber plant heterozygous for all three traits is used in a testcross, and the following progeny are produced by this testcross: S U Tu 2 s u Tu 70 S u Tu 21 s u tu 4 S U tu 82 s U tu 21 s U Tu 13 S u tu 17 Total=230 a) Determine the order of these three genes on the chromosome. b) Calculate the map distances between the genes. Show work.
9. In con, normal kernel are dominant to waxy kernels. If you crossed a waxy kernel plant to a heterozygous normal plant what type of seeds would be produced? Normal kernels (N), waxy kernel (n) Genotype: Nn, nn Phenotype: Normal kernels and waxy kernels Genotypic Ratio: 1:1 Phenotypic Ratio: 1:1
44. A trihybrid cross is made between two plants with genotypes A/a B/b C/c how many offsprings of such cross will have a genotype a/a b/b c/c - (1) 1/64 (2) 1/4 (3) 1/16 (4) 1/32
1. The allele G for yellow stigma is completely dominant to green (g). Supposingtwo strains of autotetraploid plants are available and their genotypes are as follows:GGgg – in this plant the gene is close to the centromereGggg – in this plant the gene is far from the centromere If these two plants are crossed:a) provide the gametes that can be obtained from the two plants;b) provide the genotypic and phenotypic ratios of the offspring. 2. Consider the illustration below. Diagram the configuration you would observe at Anaphase I if crossing-over happens within the inversion. (IMAGE ATTACHED)
. In nature, the plant Plectritis congesta is dimorphic forfruit shape; that is, individual plants bear either winglessor winged fruits, as shown in the illustration.Wingless fruit Winged fruitPlants were collected from nature before floweringand were crossed or selfed with the following results:Number of progenyPollination Winged WinglessWinged (selfed) 91 1*Winged (selfed) 90 30Wingless (selfed) 4* 80Winged × wingless 161 0Winged × wingless 29 31Winged × wingless 46 0Winged × winged 44 0*Phenotype probably has a nongenetic explanation.Interpret these results, and derive the mode ofinheritance of these fruit-shaped phenotypes. Usesymbols. What do you think is the nongeneticexplanation for the phenotypes marked by asterisks inthe table?
In corn, a triple heterozygote was obtained carrying themutant alleles s (shrunken), w (white aleurone), andy (waxy endosperm), all paired with their normal wildtype alleles. This triple heterozygote was testcrossed, andthe progeny contained 116 shrunken, white; 4 fully wildtype; 2538 shrunken; 601 shrunken, waxy; 626 white;2708 white, waxy; 2 shrunken, white, waxy; and 113 waxy.a. Determine if any of these three loci are linked and,if so, show map distances.b. Show the allele arrangement on the chromosomesof the triple heterozygote used in the testcross.c. Calculate interference, if appropriate.
34 a,b Note that the starting heterozygous plant does not have its parents genotypes listed. However, we can determine that the starting heterozygous plant has S,U,tu alleles on one chromosome and s,u,Tu alleles on the other because they are most common combinations in the offspring.
A certain plant has 3 un-linked gene pairs, which can be represented as AaBbCc. Upon self-fertilization what proportion of the progeny will display the dominant phenotype with respect to genes A and B and the recessive phenotype for "c"? 3/64 1/64 16/64 32/64 9164
1. The height of a wheat plant is determined by several genes. In a variety the minimum size is 12 inches and the maximum is 24 inches. 12-inch plants were crossed with 18-inch plants, and produced an 18-inch F1. The F1 was allowed to cross each other, and an F2 was obtained in which the 12 and 24 inch plants were obtained with a frequency of 2/8195. How many genes are involved in determining plant size in this variety of wheat? Select one: a. 5b. 6c. 4d. 3
33. In monohybrid cross of red and white flower, Mendel got only red flower. On setting the F1 plants having red flower he got both plants with red and white flower. Explain the basis of using. RR and rr symbols to represent the genotype of plants of parental generation