Mastering Biology with Pearson eText -- ValuePack Access Card -- for Campbell Biology: Concepts & Connections
8th Edition
ISBN: 9780321928054
Author: Jane B. Reece, Martha R. Taylor, Eric J. Simon, Jean L. Dickey, Kelly A. Hogan
Publisher: PEARSON
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Chapter 9, Problem 9TYK
A fruit fly with a gray body and red eyes (genotype BbPp) is mated with a fly having a black body and purple eyes (genotype bbpp). What ratio of offspring would you expect if the body-color and eye-color genes are on different chromosomes (unlinked)? When this mating is actually carried out, most of the offspring look like the parents, but 3% have a gray body and purple eyes, and 3% have a black body and red eyes. Are these genes linked or unlinked? What is the recombination frequency?
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A wild-type fruit fly (heterozygous for gray body color and red eyes) is mated with a black fruit fly with purple eyes. The offspring are wildtype, 721; black purple, 751; gray purple, 49; black red, 45. What is the recombination frequency between these genes for body color and eye color? Using information from problem 3, what fruit flies (genotypes and phenotypes) would you mate to determine the order of the body color, wing size, and eye color genes on the chromosome?
If a fruit fly that has long wings and a gray body (LIGG) mated with another fruit
fly that has long wings and a gray body (LIGG), what would be the phenotypic
ratio of their offspring? Also, list the different phenotypes. Do the cross! L=long
wings, l=short wings, G=gray body, g=black body.
6)
Phenotypic ratio:
(This one is more complicated). Two true breeding fruit flies are allowed to mate. One fly ishomozygous dominant for body color and eye color while the other is homozygous recessive forbody color and eye color. (g+:gray body, g:black body, e+:ebony eyes, e:red), The F1 flies areallowed to mate. What are the following probabilities in the F2 generation? For this problemmake sure to show the Punnett Square for your F2 generation and all of your calculations. Youdo not need to show the Punnett Square for the F1 generation. Answer in percent and round to 2decimals.a. Two of three fruit flies are gray and red.b. The first fruit fly is gray and ebony, the second fruit fly is gray and red, and the third fruit fly is black and ebony.
Chapter 9 Solutions
Mastering Biology with Pearson eText -- ValuePack Access Card -- for Campbell Biology: Concepts & Connections
Ch. 9 - Connecting the Concepts 1. Complete this concept...Ch. 9 - Whether an allele is dominant or recessive depends...Ch. 9 - Edward was found to be heterozygous (Ss) for...Ch. 9 - Two fruit flies with eyes of the usual red color...Ch. 9 - A man with type B blood and a woman who has type A...Ch. 9 - Tim and Jan both have freckles (see Module 9.9),...Ch. 9 - Both Tim and Jan (problem 6) have a widows peak...Ch. 9 - In rabbits, black hair depends on a dominant...Ch. 9 - A fruit fly with a gray body and red eyes...Ch. 9 - A series of matings shows that the recombination...
Ch. 9 - A couple are both phenotypically normal, but their...Ch. 9 - Why do more men than women have colorblindness?Ch. 9 - In fruit flies, the genes for wing shape and body...Ch. 9 - Adult height in humans is at least partially...Ch. 9 - Heather was surprised to discover she suffered...Ch. 9 - In 1981, a stray black cat with unusual rounded,...Ch. 9 - SCIENTIFIC THINKING The breakthrough that led...
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- A fruit fly with a gray body and red eyes (genotype BbPp) is mated with a fly having a black and purple eyes (genotype bbpp). a) Show diagrammatically a genetic cross between the two flies and the possible genotypes and phenotypes of F1. What ratio of offspring would you expect if the body-colour and eye-colour genes are on different chromosome (unlinked)? b) When mating is actually carried out, most of the offspring look like the parents, but 3% have a gray body and purple eyes, and 3% have a black body and red eyes. Compare and discuss the observation with your answer in part (a).arrow_forwardPURPLE VESTIGIAL DIHYBRID CROSS In the parental generation, you mate a pure-breeding wild-type female (put/pu+;vg+/vg+) with a pure-breeding purple, vestigial (pu/pu;vg/vg) to produce an F1 generation that is all wild-type (pu*/pu;vg+/vg). Note that the F1 flies are all dihybrid. Next, you mate several F1 dihybrid females (pu*/pu;vg+/vg) with tester males, which are purple, vestigial (pu/pu;vg/vg). The offspring of this dihybrid testcross are: Phenotype Genotype Tester Gamete Dihybrid Gamete Number Wild-type 437 417 77 59 Purple, vestigial Vestigial Purple Copy the table into your notes and derive the dihybrid gametes following the example in the first section. The columns in blue (phenotypes and numbers of offspring) are what you can see and count. The genotypes of the testcross offspring (orange) must be deduced from the phenotypes and knowing that the tester contributed pu vg gametes. Finally, you can deduce the dihybrid gametes (green) by subtracting the tester gamete contribution…arrow_forwardDrosophila have XX/XY sex determination systems just like mammals. In Drosophila, loci for both eye color and body color are on the X chromosome. Red eye color (R) is dominant to white eye color (r), and tan body color (T) is dominant to yellow body color (t). Which of the following is the genotype for a female with a yellow body and red eyes, who is homozygous for eye color? Group of answer choices XRT XrT XRt XRT XRt XRt XRt XRTarrow_forward
- You set up a cross between a male fruit fly with lobe eyes and a true breeding female fruit fly with reduced bristles and disrupted wings. In the F1 offspring you see the all the flies have WT bristles and WT wings. However, half the flies have WT eyes and half the flies have lobe eyes. You take 20 of the F1 female flies with lobe eyes and mate them to 20 true breeding male flies with reduced bristles and disrupted wings and observe the following offspring: 169 lobe eyes and reduced bristles 137 lobe eyes and disrupted wings 637 reduced bristles and disrupted wings 158 reduced bristles 36 wildtype 174 disrupted wings 657 lobe eyes 32 lobe eyes reduced bristles and disrupted wings Fruit flies are unusual in that the male fruit flies do not undergo crossovers during meiosis. If you had taken 20 of the F1 Males with lobe eyes and crossed them to 20 females that were true breeding for reduced bristles and disrupted wings what phenotypes and in what proportions would you expect in the…arrow_forwardIn a species of fly, smooth wings (W) are dominant to wrinkled wings (w) and red bodies (R) are dominant to yellow bodies (r). A WwRr and wwrr fly mate and produce the following offspring: What is the best explanation for the results? smooth red 778 smooth yellow 162 wrinkled red 158 wrinkled yellow 785 The genes for wing color and wing texture are either far apart on the same chromosome, or on separate chromosomes. The genes for wing color and wing texture are linked to each other on the same chromosome at a distance of 17 MU The genes for wing color and wing texture are linked to each other on the same chromosome at a distance of 83 MU The genes for wing color and wing texture are so far apart on the same chromosome that an excess of recombinant progeny was observedarrow_forwardFor the mating AaBBDdGg x AabbDdGG, draw the monhybrid punnet squares, one for each of the four genes shown in the cross. Assume that all genes assort independently. What fraction of the offspring would have the phenotype A_B_D_G? What fraction of the offspring would have the phenotype aaB_ddG_?arrow_forward
- Sex determination in birds is different from that in humans. The sex chromosomes in birds are called Z and W, because males have two of the same chromosome (ZZ), whereas females have two different chromosomes (ZW). There is a Z-linked allele in some birds that causes the death of the embryo when the normal dominant allele is not present. What would be the sex ratio in the living offspring of a cross between a male heterozygous for the lethal allele and a normal female? A) What are the genotypes of the parents? Male____ Female____ B) Which gametes would each form? Male____ Female____ C) Draw your Punnett square below and determine the sex ratios of living offspring.arrow_forwardIn the fruit fly Drosophila melanogaster, normal eye color is red. A recessive allele, when homozygous, causes the eyes to be white. P generation: A fly that is homozygous for the red allele (RR) is crossed with a fly that is homozygous for the white allele (rr). All offspring (F1 generation) have red eyes. F1 generation: The red-eyed offspring from the above mating are crossed with one another. What proportion of their offspring (F2 generation) will have red eyes? one fourth three quarters 100% halfarrow_forwardA red-eyed (dominant) female with a grey (dominant) body is crossed with red-eyed (dominant) male with a yellow body (recessive) The pair of fruit flies (given above) produce 320 offspring together from a single mating: 57 red-eyed females with grey bodies, 61 red-eyed females with yellow bodies, 22 brown- eyed females with grey bodies, 20 brown-eyed females with yellow bodies. 59 red-eyed males with grey bodies, 63 red-eyed males with yellow bodies, 20 brown-eyed males with grey bodies, 18 brown-eyed males with yellow bodies. From this information only (NO genetic diagrams required), what evidence and logic can you use to deduce the genetic identity of the parent flies?arrow_forward
- In Drosophila, red eyes is a wild-type phenotype. Several different genes affect eye color. One allele causes purple eyes, and a different allele causes sepia eyes. Both of these are recessive to red eye color. When flies with purple eyes were crossed to flies with sepia eyes, all F1 flies had red eyes. When the F1 offspring were allowed to mate, the F2 flies were as follows: 162 purple eyes 172 sepia eyes 58 purplish sepia eyes 478 red eyes Explain this pattern of inheritance. Use a chi square test to test the goodness of fit of your hypothesis with the dataarrow_forwardFruitflies of genotype AABB are bred to fruitflies with genotype aabb. The F1 offspring are then bred to fruitflies of genotype aabb. The F2 offspring have the following genotypes: Aabb 14 flies AaBb 413 flies aabb 419 flies aaBb 15 flies a. Are genes A and B on the same chromosome? Yes No b. Show how you would calculate the genetic distance between genes A and B.arrow_forwardIn fruit flies, the allele for normal wings (V) is dominant to the allele for short wings (v). Suppose two fruit flies heterozygous for the trait are mated. What is the male fruit fly’s genotype and the female fruit fly’s genotype? What is the male fruit fly’s phenotype and the female fruit fly’s phenotype? What will be the genotypic ratio of the F1 generation? What will be the phenotypic ration of the F1 generation?arrow_forward
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