Concept explainers
A male and a female mouse are each from pure-breeding albino strains. They have a litter of
a. Using clearly defined allele symbols of your own c hoosing, give the genotypes of parental and
b. What genetic phenomenon explains the
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Genetic Analysis: An Integrated Approach (2nd Edition)
- Pigment in mouse fur is only produced when the C allele is present. Individuals of the cc genotype are white. If color is present, it may be determined by the A, a alleles. AA or Aa results in agouti color, while aa results in black coats. (a) What F1 and F2 genotypic and phenotypic ratios are obtained from a cross between AACC and aacc mice? (b) In three crosses between agouti females whose genotypes were unknown and males of the aacc genotype, the following phenotypic ratios were obtained: (1) 8 agouti (2) 9 agouti (3) 4 agouti 8 white 10 black 5 black 10 white What are the genotypes of these female parents?arrow_forwardAssume that you have a garden and some pea plants have solid leaves and others have striped leaves. You conduct a series of crosses (a through e) and obtain the results given in the table. Progeny Cross Solid Striped (a) solid X striped 55 60 (b) solid X solid 36 0 (c) striped X striped 0 65 (d) solid X solid 92 30 (e) solid X striped 44 0 Define gene symbols and give the possible genotypes of the parents of each cross.arrow_forwardThree genes in fruit flies affect a particular trait, and at least one dominant allele of each gene is necessary to get a wild-type phenotype. a. What phenotypic ratio would you predict among the progeny if you crossed triply heterozygous flies? b. You cross a particular wild-type male in succession with three tester strains. In the cross with one tester strain (AA bb cc), only 1/4 of the progeny are wild type. In the crosses involving the other two tester strains (aa BB cc and aa bb CC), half of the progeny are wild type. What is the genotype of the wild-type male? (Pls help asap!!)arrow_forward
- A. You cross a true-breeding sunflower, with yellow flowers and black seeds, with another true-breeding sunflower, with white flowers and green seeds. All of the F1 generation have yellow flowers and green seeds. Create allele symbols and genotypes for these genes and create a representation of this cross, which is consistent with the stated premises. Show your work. B. Upon completing an F1xF1 cross of the yellow flower, green seed sunflowers, you observe the following phenotype classes of offspring in the F2: 250 Yellow flowers and black seeds; 250 white flowers and green seeds; 500 yellow flowers and green seeds. A test cross of the yellow flower, green seed F1 generation generates the following offspring: 500 white flowers and green seeds; 500 yellow flowers and black seeds. Do these observations taken together, of the F1, F2, and test cross offspring, respectively, represent violations of Mendel's first law, Mendel's second law, or both? Explain your answer.arrow_forwardThe long hair of Persian cats is recessive to the short hair of Siamese cats, but the black coat color of Persians is dominant to the brown-and-tan coat color of Siamese. Make up appropriate symbols for the alleles of these two unlinked loci. If a pure black, long-haired Persian is mated to a pure brown-and-tan, short-haired Siamese, what will be the appearance of the F1 offspring? If two of these F1 cats are mated, what is the chance that a long-haired, brown-andtan cat will be produced in the F2 generation? (Use the shortcut probability method to obtain your answer; then check it with a Punnett square.)arrow_forwardThe long hair of Persian cats is recessive to the short hair of Siamese cats, but the black coat color of Persians is dominant to the brown-and-tan coat color of Siamese. Make up appropriate symbols for the alleles of these two unlinked loci. If a pure black, long-haired Persian is mated to a pure brown-and-tan, short-haired Siamese, what will be the appearance of the F1 offspring? If two of these F1 cats are mated, what is the chance that along-haired, brown-and-tan cat will be produced in the F2 generation? (Use the shortcut probability method to obtain your answer; then check it with a Punnett square.)arrow_forward
- Below is a pedigree of a human genetic disease in which solid color indicates affected individuals. Assume that the disease is caused by a gene that can have the alleles A or a. a) Based on this pedigree, what is the most likely mode of inheritance? b) What is/are the possible genotype/s of person 1? c) What is/are the possible genotype (s) of person 4 ? Explain your answers.arrow_forwardIf two gene pairs A and a and B and b are assorting independently with A dominant to a and B dominant to b, what is the probability of obtaining: a. an AB gamete from an AaBb individual? b. an AABB zygote from an AaBb x AaBb cross? c. an aaBb offspring from an AaBB x aabb cross? d. a phenotype aB from an Aabb x aaBb cross? e. an ab gamete from an aaBB individual?arrow_forwardA homozygous strain of corn that produces yellow kernels is crossed with another homozygous strain that produces purple kernels. When the F1 are interbred, 197 of the F2 are yellow and 153 are prurple. Give the genotypes of the yellow and purple F2 and propose a genetic model that explains the inheritance of these kernel colors in corn.arrow_forward
- In the tomato, yellow flowers (Y) is dominant to white flowers (y). A true-breeding yellow flowered strain is crossed with a true-breeding white flowered strain.A. If the F1 generation is self crossed, what will be the genotypes and phenotypes of the progeny and in what portions are they expected? B. If an F1 plant were crossed with a plant from true-breeding white flowered strain, what will be the genotypes and phenotypes of the progeny and in what portions are they expected?arrow_forwardScale color in a lizard species is inherited via a single gene with 6 different alleles. (a) How many different types of gametes would be possible in this system? (b) What is the maximum number of different types of scale color gametes that could be produced from one individual lizard?arrow_forward. Male house cats are either black or orange; females areblack, orange, or calico.a. If these coat-color phenotypes are governed by a sexlinked gene, how can these observations be explained?b. Using appropriate symbols, determine the phenotypes expected in the progeny of a cross between anorange female and a black male.c. Half the females produced by a certain kind of matingare calico, and half are black; half the males are orange,and half are black. What colors are the parental malesand females in this kind of mating?d. Another kind of mating produces progeny in thefollowing proportions: one-fourth orange males, onefourth orange females, one-fourth black males, and onefourth calico females. What colors are the parental malesand females in this kind of mating?arrow_forward
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