7. A male fly that is homozygous for recessive alleles at two linked autosomal genes is matedwith a wild-type female fly that is homozygous dominant for both alleles. All F, offspring arethen randomly mated. If the genes are so close as to have no recombination, what proportion ofoffspring will be homozygous for both mutations in the F, generation? Briefly justify youranswer.

According to Mendelian inheritance, every character is controlled by one or more pairs of alleles…

Answered: 7. A male fly that is homozygous for…

Biology: The Dynamic Science (MindTap Course List)

4th Edition

ISBN:9781305389892

Author:Peter J. Russell, Paul E. Hertz, Beverly McMillan

Publisher:Peter J. Russell, Paul E. Hertz, Beverly McMillan

Chapter12: Mendel, Genes, And Inheritance

Section: Chapter Questions

Problem 6TYK

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Another gene in Drosophila determines wing length. The dominant wild-type allele of this gene produces long wings; a recessive allele produces vestigial (short) wings. A female that is true- breeding for red eyes and long wings is mated with a male that has purple eyes and vestigial wings. F1 females are then crossed with purple-eyed, vestigial-winged males. From this second cross, a total of 600 offspring are obtained with the following combinations of traits: 252 with red eyes and long wings 276 with purple eyes and vestigial wings 42 with red eyes and vestigial wings 30 with purple eyes and long wings Are the genes linked, unlinked, or sex-linked? If they are linked, how many map units separate them on the chromosome?
2.In dogs, there is a hereditary deafness caused by a recessive allele, d. A kennel owner has a male dog that she wants to use for breeding purposes if possible. The dog can hear, but the owner is unsure of the genotype. She does a testcross (crosses it to a homozygous recessive dog), and two of the five offspring are deaf. This means that the male dog A.has the genotype DD B.has the genotype Dd C.is still of unknown genotype since there were offspring of both deaf and hearing phenotypes. D.has the genotype dd
1. A sex-linked recessive allele rg causes a red-green colorblindness in humans. A normal woman whose father was colorblind marries a colorblind man. A. Of all the children of these parents (sex unspecified), what proportion can be expected to have normal color vision?
7. If the a and b loci are 20 m.u. apart in humans and anA B / a b woman mates with an a b / a b man, what isthe probability that their first child will be A b / a b?
1. In fruit flies, the phenotype for eye color is determined by a certain locus. E indicates the dominant allele and eindicates the recessive allele. The cross between a male wild-type fruit fly and a female white-eyed fruit flyproduced the following offspring.Wild-typeMaleWild-typeFemaleWhite-eyedMaleWhite-eyedFemaleBrown-eyedFemaleF1 0 45 55 0 1The wild-type and white-eyed individuals from the F1 generation were then crossed to produce the followingoffspring.F2 23 31 22 24 0(a) Determine the genotypes of the original parents (P generation) and explain your reasoning. You may usePunnett squares to enhance your description, but the results from the Punnett squares must be discussed inyour answer.(b) Use a Chi-squared test on the F2 generation data to analyze your prediction of the parental genotypes. Showall your work and explain the importance of your final answer.(c) The brown-eyed female in the F1 generation resulted from a mutational change. Explain what a mutation is,and discuss…
1. In a cross between a black and a white guinea pig, all members of the F1 generation are black. The F2 generation is made up of approximately 3/4 black and 1/4 white guinea pigs. (a) Diagram this cross, showing the genotypes and phenotypes. (b) What will the offspring be like if two F2 white guinea pigs are mated?
1. If a purebred pea plant with purple flowers was crossed with a purebred pea plant with white flowers, all of the offspring's flowers ended up being purple. In this instancethe WHITE flower trait is considered to be what?
2. In four-o’clocks, the allele for red flowers is incompletely dominant to the allele for white flowers, soheterozygotes have pink flowers. What ratios offlower colors would you expect among the offspringof the following crosses: (a) pink × pink, (b) white ×pink, (c) red × red, (d) red × pink, (e) white × white,and (f) red × white? If you specifically wanted to produce pink flowers, which of these crosses would bemost efficient?
5. In the fruit fly Drosophila melanogaster, very dark(ebony) body color is determined by the e allele. Thee+ allele produces the normal wild-type, honeycolored body. In heterozygotes for the two alleles (butnot in e+e+ homozygotes), a dark marking called thetrident can be seen on the thorax, but otherwise thebody is honey-colored. The e+ snd e alleles are thusconsidered to be incompletely dominant.a. When female e+e+ flies are crossed to male e+eflies, what is the probability that progeny will havethe dark trident marking?b. Animals with the trident marking mate amongthemselves. Of 300 progeny, how many would beexpected to have a trident, how many ebony bodies, and how many honey-colored bodies?
1. A male fruit fly, heterozygous for both vestigial wings and ebony body, is crossed with a female homozygous for normal wings and heterozygous for ebony body. What fraction of their offspring will have normal wings and an ebony body?
4) In frost moths, two alleles of one gene determine the character difference of spotted versus striped wings and two alleles of a separate, independent gene determine the character difference of orange wing background versus white wing background. The results for four matings of moth phenotypes are shown in the image attached. a) Assign the letter “s” to the wing pattern gene and letter “w” to the background color gene. Write in the capital letter for the dominant phenotype and the lower case letter for the recessive phenotype. Also, write whether each allele is dominant (D) or recessive (R). Wing pattern gene: Spotted - letter assignment:____ - dominant or recessive:____ Striped - letter assignment:____ - dominant or recessive:____ Background color gene: orange: - letter assignment:____ - dominant or recessive:____ white: - letter assignment:____ - dominant or recessive:_____ b) Based on the four matings in Question 4: What are the genotypes of each parent in each cross? If more…
1)A researcher crossed a homozygous yellow seed plant (YY) and a heterozygous yellowseed plant (Yy). Draw a Punnett Square and determine the genotype and phenotyperatios of the offspring. please explain it simple and no copypastes thanks

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