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The wild-type color of horned beetles is black, although other colors are known. A black horned beetle from a pure-breeding strain is crossed to a pure-breeding green female beetle. All of their
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Genetic Analysis: An Integrated Approach (3rd Edition)
- 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 a cross between a black and a white cat, all members of the Fi generation are black. The F2 generation is made up of approximately 3/4 black and 1/4 white cat. (i) Diagram this cross, showing the genotypes and phenotypes of the parents, F, and F2 generations. What is the probability that the first two offspring will be homozygous and the third is white if an Ficat is test crossed?arrow_forwardA female animal with genotype A/a ⋅ B/b is crossed with a double-recessive male (a/a ⋅ b/b). Their progeny include 442 A/a ⋅ B/b, 458 a/a ⋅ b/b, 46 A/a ⋅ b/b, and 54 a/a ⋅ B/b. Explain these results.arrow_forward
- Purebred 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_forwardYou are working for a parakeet breeder that has some green birds and some blue birds. You want to determine which feather color is dominant. You cross a blue male to each of two green females. In the first cross, the blue male is crossed to a green female named Gabby, resulting in 2 green and 2 blue offspring. In the second cross, the same blue male is crossed to a green female named Gail, resulting in 5 green offspring. Based on these results: ● [Select] phenotype is dominant. • Gail's genotype is [Select] The cross between the male and Gabby is called a [ Select] cross.arrow_forwardAn insect from a strain breeding for white eyes (RRww) was crossed to an insect from a strain breeding for cream eye (rrWW). The F1 all had red eyes. The F1s were intercrossed to produce F2 generation that consisted of 175 red eyed:81 white eyed. Provide the genetics of inheritance of this trait. Provide the genotypes for the F1s and F2s of this cross.arrow_forward
- In the video game Animal Crossing: New Horizons, flowering breeding is based in genetics. Each flower's color is determined by the genotype at three or four unlinked genes: R, Y, W, and S. The genotype of the elusive blue rose is RR YY ww ss. In the game, one way to get a blue rose is to cross two roses with the Rr Yy Ww ss genotype. A) What types of gametes and in what proportions will a Rr Yy Ww ss rose produce? B) In a cross Rr Yy Ww ss x Rr Yy Ww ss what are the possible offspring genotypes and at what frequency will they each appear? Show your work. C) What proportion of the offspring of the cross will be blue roses?arrow_forwardThree pairs of brown rats were crossed. These crossings produce progenies with the following ratios: Pair 1: All the progenies were brown. Crossing between these progenies produced an F2 generation with all brown rats. Pair 2: About ¾ of the F1 progenies are brown and ¼ are white. If a pair of white F1 progeny is crossed, it will produce progenies that are all white. But if a pair of brown F1 progeny is crossed, not all F2 progenies are brown. Pair 3: All the F1 progenies were brown. When these progenies are crossed with white rats, half of the F2 progenies are white and half are brown. Based on the information given above, answer these questions: (a) How many genes are involved in controlling the coat colour of rat? (b) Give suitable symbols to represent all the genes. (c) Draw cross diagrams to describe all the crosses.arrow_forwardIn venetian violets, three phenotypes occur with respect to flower color: a deep violet (almost back), a white, and a pale lavender. Two pale lavender flowered plants have been crossed. The F1 from this cross has individuals with deep violet flowers, with pale lavender flowers, and individuals with white flowers. A. what are the parent genotypes? B. what would the expected phenotypic ratio be in these F1 plants?arrow_forward
- A number of true-breeding brown dogs were crossed with a true-breeding white breed. All the pups were brown. When several of the F1's were allowed to breed, the F2's were 92 brown, 58 black and 10 white. Provide a genetic explanation for these results and show the genotypes of the two original parents.arrow_forwardJ.W. McKay crossed a stock (true-breeding) melon plant that produced tan seeds with a plant that only produced red seeds and obtained the following results (J.W. McKay. 1936. Journal of Heredity 27:110-112). Cross F1 F2 Tan x red 13 tan 93 tan, 24 red a) Explain the inheritance of tan seeds and red seeds in this plant. b) Assign symbols for the alleles in this cross and draw out the Punnett Squares for the initial cross and the F1 cross.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
- Biology (MindTap Course List)BiologyISBN:9781337392938Author:Eldra Solomon, Charles Martin, Diana W. Martin, Linda R. BergPublisher:Cengage Learning