Pea plants have two independently assorted genes that code for seed shape (round or wrinkled) and seed color (yellow or green), respectively. A researcher crosses two pea plants and observes that all F1 offspring have the same phenotype: round shape and yellow seeds. He then performs a test cross with an F1 offsprin and observes four different phenotypes in a 1:1:1:1 ratio. Based on this information the researcher concludes the genotypes of the parents. Which of the following is true regarding a recessive allele? a) O In a heterozygous offspring the dominant and the recessive alleles are on the same chromosome b) In a homozygous recessive offspring both recessive alleles are on the same chromosome In a heterozygous offspring both the dominant and recessive alleles are expressed, but dominant allele is expressed more frequently c) d) In a heterozygous offspring the dominant allele is expressed and the recessive allele is suppressed e) In a heterozygous offspring both the dominant and recessive alleles are expressed Boş bırak

Pea plants have two independently assorted genes that code for seed shape (round or wrinkled) and seed color (yellow or green), respectively. A researcher crosses two pea plants and observes that all F1 offspring have the same phenotype: round shape and yellow seeds. He then performs a test cross with an F1 offsprin and observes four different phenotypes in a 1:1:1:1 ratio. Based on this information the researcher concludes the genotypes of the parents. Which of the following is true regarding a recessive allele? a) O In a heterozygous offspring the dominant and the recessive alleles are on the same chromosome b) In a homozygous recessive offspring both recessive alleles are on the same chromosome In a heterozygous offspring both the dominant and recessive alleles are expressed, but dominant allele is expressed more frequently c) d) In a heterozygous offspring the dominant allele is expressed and the recessive allele is suppressed e) In a heterozygous offspring both the dominant and recessive alleles are expressed Boş bırak

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 17QP

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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.
In rabbits, black hair is due to a dominant allele B and brown hair to its recessive allele b. Short hair (H) is dominant to long hair (h). Show punnet squares In a cross between a homozygous black, longhaired rabbit and a brown, homozygous shorthaired one, what would the F1 generation look like? If you did not know the genotype of an F1 rabbit, you could determine its genotype by a test cross in which it is crossed with an animal with which phenotype AND genotype? If you carried out this test cross (from 2, using the F1 from 1), what phenotypes and in what ratio would you expect? What phenotypes in what ratio would be expected in the F2 generation of the cross in point 1?
Red eyes is the wild-type phenotype in Drosophila, and severaldifferent genes (with each gene existing in two or more alleles) affect eye color. One allele causes purple eyes, and a different allelecauses vermilion eyes. The purple and vermilion alleles are recessive to red eye color. Two types of crosses provided thefollowing data:Cross 1: Males with vermilion eyes × females with purple eyes354 offspring, all with red eyesCross 2: Males with purple eyes × females with vermilion eyes212 male offspring with vermilion eyes221 female offspring with red eyesExplain the pattern of inheritance based on these results. Whatadditional crosses might you make to confirm your hypothesis?
In wild sunflowers, populations occurs that are either yellow or white. one variety of true breeding white flowered plants was crossed to another pure strain of white flowered plants. the resulting F1 progeny were yellow flowered plants. When the F1 progeny were intercrossed, the offspring were 56 yellow flowers and 44 white flowers. From these results, how many genes control the flower color? Is any one gene epistatic to any other gene?
A particular breed of dog can have long hair or short hair. Whentrue-breeding long-haired animals were crossed to true-breedingshort-haired animals, the offspring all had long hair. The F2 generation showed a 3:1 ratio of long- to short-haired offspring. Asecond gene affects the texture of the hair. The two variants arewiry hair and straight hair. F1 offspring from a cross of these twovarieties all had wiry hair, and F2 offspring showed a 3:1 ratio ofwiry-haired to straight-haired puppies. Recently, a breeder of theshort- and wiry-haired dogs found a female puppy that was albino.Similarly, another breeder of the long- and straight-haired dogsfound a male puppy that was albino. Because the albino trait is always due to a recessive allele, the two breeders got together andmated the two dogs. Surprisingly, all of the puppies in the litterhad black hair. How can you explain this result?
In a variety of tomato plant ,the leaves maybe pure green,pure white,or variegated (mixture). a)when 2 variegated plants were crossed,87 offspring were produced,of these 20 were green,46 were variegated and 21 remain died soon after germination.Draw a genetic diagram to explain these results,why did 21 of them died
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?
Imagine you are performing a cross involving gerden pea plants. What F1 offspring would you expect if you cross plants with green seedsand plants that are homozygous for the yellow seed colo allele? -yellow seed is dominant over green 100 percent yellow - green sedds 100 percent yellow seeds 50 percent yellow, 50 percent green seeds 25 percent green, 75 percent yellow seeds
In the tomato, three genes are linked on the same chromosome. Tallis dominant to dwarf, skin that is smooth is dominant to skin that ispeachy, and fruit with a normal rounded tomato shape is dominantto oblate (flattened) shape. A plant that is true-breeding for thedominant traits was crossed to a dwarf plant with peachy skin andoblate fruit. The F1 plants were then testcrossed to dwarf plants withpeachy skin and oblate fruit. The following results were obtained: 151 tall, smooth, normal33 tall, smooth, oblate11 tall, peach, oblate2 tall, peach, normal155 dwarf, peach, oblate29 dwarf, peach, normal12 dwarf, smooth, normal0 dwarf, smooth, oblate A) Determine the coefficient of coincidence and the interference for these three loci.
A sex-influenced trait is dominant in males and causes bushy tails.The same trait is recessive in females. Fur color is not sex influenced.Yellow fur is dominant to white fur. A true-breeding femalewith a bushy tail and yellow fur was crossed to a white male withouta bushy tail (i.e., a normal tail). The F1 females were thencrossed to white males without bushy tails. The following resultswere obtained:A. Conduct a chi square analysis to determine if these two genesare linked.B. If the genes are linked, calculate the map distance betweenthem. Explain which data you used in your calculation.
In a test cross, an individual dominant for a certain trait ( whether homozygous or heterozygous is unknown) is crossed with a homozygous recessive individual. A plant with spherical seeds is crossed with another plant. If the genotypes and phenotypes of the offspring are 100% heterozygous and 100% dominant, what were the genotypes of the parents? (hint: try multiple crosses until you find what works) If the genotypes and phenotypes of the offspring are 50% heterozygous spherical seeds and 50% wrinkled seeds, what were the genotypes of the parents?
As a hypothetical example, a trait in mice results in abnormallylong tails. You initially have a true-breeding strain with normaltails and a true-breeding strain with long tails. You then make thefollowing types of crosses:Cross 1: When true-breeding females with normal tails arecrossed to true-breeding males with long tails, all F1 offspringhave long tails.Cross 2: When true-breeding females with long tails arecrossed to true-breeding males with normal tails, all F1 offspring have normal tails.Cross 3: When F1 females from cross 1 are crossed to true-breeding males with normal tails, all offspring have normal tailsCross 4: When F1 males from cross 1 are crossed to truebreeding females with long tails, half of the offspring havenormal tails and half have long tails.Explain the pattern of inheritance of this trait.