231 A Mendelian experiment consisted of breeding tall pea plants bearing violet flowers with short pea plants bearing white flowers. The progeny all bore violet flowers, but almost half of them were short. This suggests that the genetic makeup of the tall parent can be depicted as: TTWW TTWW TtWw Biology

231 A Mendelian experiment consisted of breeding tall pea plants bearing violet flowers with short pea plants bearing white flowers. The progeny all bore violet flowers, but almost half of them were short. This suggests that the genetic makeup of the tall parent can be depicted as: TTWW TTWW TtWw Biology

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Description: 000OQ31A Mendelian experiment consisted ofbreeding tall pea plants bearing violetflowers with short pea plants bearingwhite flowers. The progeny all boreviolet flowers, but almost half of themwere short. This suggests that thegenetic makeup of the t

Human Heredity: Principles and Issues (MindTap Course List)

11th Edition

ISBN:9781305251052

Author:Michael Cummings

Publisher:Michael Cummings

Chapter3: Transmission Of Genes From Generation To Generation

Section: Chapter Questions

Problem 30QP: Variations on a Theme by Mendel Pea plants usually have white or red flowers. A strange pea-plant...

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More Crosses with Pea Plants: The Principle of Independent Assortment Determine the possible genotypes of the following parents by analyzing the phenotypes of their children. In this case, we will assume that brown eyes (B) is dominant to blue (b) and that right-handedness (R) is dominant to left-handedness (r). a. Parents: brown eyes, right-handed brown eyes, right-handed Offspring: 3/4 brown eyes, right-handed 1/4 blue eyes, right-handed b. Parents: brown eyes, right-handed blue eyes, right-handed Offspring: 6/16 blue eyes, right-handed 2/16 blue eyes, left-handed 6/16 brown eyes, right-handed 2/16 brown eyes, left-handed c. Parents: brown eyes, right-handed blue eyes, left-handed Offspring: 1/4 brown eyes, right-handed 1/4 brown eyes, left-handed 1/4 blue eyes, right-handed 1/4 blue eyes, left-handed
Variations on a Theme by Mendel Pea plants usually have white or red flowers. A strange pea-plant variant is found that has pink flowers. A selfcross of this plant yields the following phenotypes: 30 red flowers 62 pink flowers 33 white flowers What are the genotypes of the parents? What is the genotype of the progeny with red flowers?
For all seven characters described in the data of Mendel allowed the F2 plants to self-fertilize. He found that whenF2 plants with recessive traits were crossed to each other, theyalways bred true. However, when F2 plants with dominant traitswere crossed, some bred true but others did not. A summary ofMendel’s results is shown to the right When considering the data in this table, keep in mind that theydescribe the characteristics of the F2 generation parents that haddisplayed a dominant phenotype. These data were deduced byanalyzing the outcome of the F3 generation. Based on Mendel’slaws, explain why the ratios were approximately 1:2
A cross between two pea plants, both of which grewfrom yellow round seeds, gave the following numbersof seeds: 156 yellow round and 54 yellow wrinkled.What are the genotypes of the parent plants? (Yellowand round are dominant traits.)
A trait in garden peas involves the curling of leaves. A two-factorcross was made by crossing a plant with yellow pods and curlingleaves to a wild-type plant with green pods and normal leaves. AllF1 offspring had green pods and normal leaves. The F1 plants werethen crossed to plants with yellow pods and curling leaves. Thefollowing results were obtained: 117 green pods, normal leaves115 yellow pods, curling leaves78 green pods, curling leaves80 yellow pods, normal leavesA. Conduct a chi square analysis to determine if these two genesare linked.B. If they are linked, calculate the map distance between the twogenes. How accurate do you think this calculated distance is?
A geneticist from an alien planet that prohibits genetic researchbrought with him two true-breeding lines of frogs. One frogline croaks by uttering “rib-it rib-it” and has purple eyes. Theother frog line croaks by muttering “knee-deep knee-deep” andhas green eyes. He mated the two frog lines, producing F1 frogsthat were all utterers with blue eyes. A large F2 generation thenyielded the following ratios: 27/64 blue, utterer12/64 green, utterer9/64 blue, mutterer9/64 purple, utterer4/64 green, mutterer3/64 purple, mutterer Question: Assign gene symbols for all phenotypes, and indicate the genotypes of the P1, F1, and F2 frogs.
A geneticist from an alien planet that prohibits genetic researchbrought with him two true-breeding lines of frogs. One frogline croaks by uttering “rib-it rib-it” and has purple eyes. Theother frog line croaks by muttering “knee-deep knee-deep” andhas green eyes. He mated the two frog lines, producing F1 frogsthat were all utterers with blue eyes. A large F2 generation thenyielded the following ratios: 27/64 blue, utterer12/64 green, utterer9/64 blue, mutterer9/64 purple, utterer4/64 green, mutterer3/64 purple, mutterer Question: How many total gene pairs are involved in the inheritance of both eye color and croaking?
A geneticist from an alien planet that prohibits genetic researchbrought with him two true-breeding lines of frogs. One frogline croaks by uttering “rib-it rib-it” and has purple eyes. Theother frog line croaks by muttering “knee-deep knee-deep” andhas green eyes. He mated the two frog lines, producing F1 frogsthat were all utterers with blue eyes. A large F2 generation thenyielded the following ratios: 27/64 blue, utterer12/64 green, utterer9/64 blue, mutterer9/64 purple, utterer4/64 green, mutterer3/64 purple, mutterer Question: After many years, the frog geneticist isolated true-breeding lines of all six F2 phenotypes. Indicate the F1 and F2 phenotypic ratios of a cross between a blue, mutterer anda purple, utterer.
A student whose hobby was fishing pulled a very unusual carp out of Cayuga Lake: It had no scales on itsbody. She decided to investigate whether this strangenude phenotype had a genetic basis. She therefore obtained some inbred carp that were pure-breeding forthe wild-type scale phenotype (body covered withscales in a regular pattern) and crossed them with hernude fish. To her surprise, the F1 progeny consistedof a 1:1 ratio of wild-type fish and fish with a singlelinear row of scales on each side.a. Can a single gene with two alleles account for thisresult? Why or why not?b. To follow up on the first cross, the student allowedthe linear fish from the F1 generation to mate witheach other. The progeny of this cross consisted offish with four phenotypes: linear, wild type, nude,and scattered (the latter had a few scales scattered irregularly on the body). The ratio of these phenotypeswas 6:3:2:1, respectively. How many genes appear tobe involved in determining these phenotypes?c. In…
Summer squash exist in long, spherical, or disk shapes. When atrue-breeding long-shaped strain was crossed to a true-breedingdisk-shaped strain, all of the F1 offspring were disk-shaped. Whenthe F1 offspring were allowed to self-fertilize, the F2 generationconsisted of a ratio of 9 disk-shaped to 6 round-shaped to 1 longshaped. Assuming the shape of summer squash is governed by twodifferent genes, with each gene existing in two alleles, propose amechanism to account for this 9:6:1 ratio
Albino rabbits (lacking pigment) are homozygous forthe recessive c allele (C allows pigment formation).Rabbits homozygous for the recessive b allele makebrown pigment, while those with at least one copy ofB make black pigment. True-breeding brown rabbitswere crossed to albinos, which were also BB. F1 rabbits, which were all black, were crossed to the doublerecessive (bb cc). The progeny obtained were 34black, 66 brown, and 100 albino.a. What phenotypic proportions would have beenexpected if the b and c loci were unlinked?b. How far apart are the two loci?
In one study, Gregor Mendel crossed yellow-seeded, tall garden pea with a green-seeded,short garden pea. The F1 offspring were all yellow-seeded and tall. Assumingindependent assortment of these two genes, what phenotypes and proportions did he finamong F2 offspring when the F1 garden peas are allowed to fertilize themselves? Show the solution with punnett square.