Homework Answers
If chromosomes assort independently they have a recombination frequency of 50%, linked genes have a recombination frequency which is less than 50%.
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(1) A Drosophila male from a true-breeding stock with scabrous eyes and normal bristles was mated...
5. In Drosophila, males from a true-breeding stock with raspberry-colored eyes were mated to females from...
5. In Drosophila, males from a true-breeding stock with raspberry-colored eyes were mated to females from a true-breeding stock with sable-colored bodies. In the F1 generation, all the females had wild-type eye and body color, while all the males had wild-type eye color but sable-colored bodies. When F1 males and females were mated to each other, the F2 was composed of: 216 females with wild-type eyes and wild-type bodies 223 females with wild-type eyes and sable bodies 191 males with...
A virgin Drosophila female whose thorax bristles are very short is mated with a males having...
A virgin Drosophila female whose thorax bristles are very short is mated with a males having normal (long) bristles. The F1 progeny are 1/3 short-bristle females, 1/3 long bristle females, and 1/3 long bristle males. A cross of the F1 long bristle females with their brothers gives only long bristle F2 progeny. A cross of short bristle females with their brothers gave 1/3 long bristle females, 1/3 short bristle females, and 1/3 long bristle males. Explain what is going on...
In Drosophila, purple eyes (pr) are recessive to wild type red eyes (pr+), and forked bristles...
In Drosophila, purple eyes (pr) are recessive to wild type red eyes (pr+), and forked bristles (1) are recessive to wild type bristles (fº). A pure breeding purple eyed, forked bristled fly was mated to a pure breeding red eyed, wild type bristled fly. The resulting F1s were crossed to true breeding purple eyed, forked bristled fly, and the following offspring were observed: 322 red eyed, wild type bristles 318 purple eyed, forked bristles 78 red eyes, forked bristles 82...
In Drosophila, purple eyes (pr) are recessive to wild type red eyes (pr+), and forked bristles...
In Drosophila, purple eyes (pr) are recessive to wild type red eyes (pr+), and forked bristles (f) are recessive to wild type bristles (f+). A pure breeding purple eyed, forked bristled fly was mated to a pure breeding red eyed, wild type bristled fly. The resulting F1s were crossed to true breeding purple eyed, forked bristled fly, and the following offspring were observed: 322 red eyed, wild type bristles 318 purple eyed, forked bristles 78 red eyes, forked bristles 82...
You are working with Drosophila, and cross females from a true-breeding strain with white eyes to...
You are working with Drosophila, and cross females from a true-breeding strain with white eyes to males from a true-breeding strain with red eyes. You examine 200 offspring (100 males and 100 females) from this cross. Which of the following matches the expected outcome? A) 100 red-eyed females, 100 red-eyed males B) 100 red-eyed females, 100 white-eyed males C) 50 red-eyed females, 50 white-eyed females, 50 red-eyed males, 50 white-eyed males D) 100 red-eyed females, 50 red-eyed males, 50 white-eyed...
Problem 1 The data set below summarizes progeny (F2 generation) resulting from a cross between two...
Problem 1 The data set below summarizes progeny (F2 generation) resulting from a cross between two F individuals, originating from a cross of two true breeding Drosophila strains (P generation), which differ with respect to two traits. Produce a hypothesis about the mode of inheritance of the genes and analyze whether the data fits your hypothesis by using the Chi-square test A1 wild type, females 334 purple eyes, females 98 purple eyes, tan body, males 47 wild type, males 161...
Mapping genes with recombination frequencies in Drosophila 1. Suppose you know of three linked loci on...
Mapping genes with recombination frequencies in Drosophila 1. Suppose you know of three linked loci on the Drosophila X chromosome (a, b, and c). Assume that you are starting out with true-breeding stocks that show all three recessive traits and true-breeding stocks that show all three dominant traits. A. If you wanted to do a 3-point test cross to map the three loci, how would you set up the cross? What genotypes do you use for males and females in...
Drosophila females of wild-type appearance but heterozygous for three autosomal traits are mated to males that...
Drosophila females of wild-type appearance but heterozygous for three autosomal traits are mated to males that are homozygous recessive for the three traits. The three autosomal recessive traits are glassy eyes (g), coal-colored bodies (c), and striped thoraxes (t). The three dominant traits are red eyes (g+), gray bodies (c+) and solid thoraxes (t+) (remember, the wild-type allele has a + after it). You examine 1000 progeny of the above cross and they have the following phenotypic classes: 265 g+c+t+ 275 gct 120 g+ct...
Cinnabar eyes (cn) and reduced bristles (rd) are autosomal recessive characters in Drosophila. A homozygous wild-type...
Cinnabar eyes (cn) and reduced bristles (rd) are autosomal recessive characters in Drosophila. A homozygous wild-type female was crossed to a reduced, cinnabar male, and the F1 males were then crossed to the F1 females to obtain the F2. Of the 400 F2 offspring obtained, 292 were wild type, 9 were cinnabar, 7 were reduced, and 92 were reduced and cinnabar.
A female fruit fly with vermilion eyes and normal wings is crossed to a male with...
A female fruit fly with vermilion eyes and normal wings is crossed to a male with normal red eyes and cut wings. The F1 progeny consist of females with red eyes and normal wings, and males with vermilion eyes and normal wings. When the F1 progeny are interbred, the F2 consists of two types of females vermilion eyes, normal wings (1/2) and red eyes, normal wings (12), and two types of males-vermilion eyes, normal wings (12) and red eyes, cut...
5. In Drosophila, males from a true-breeding stock with raspberry-colored eyes were mated to females from a true-breeding stock with sable-colored bodies. In the F1 generation, all the females had wild-type eye and body color, while all the males had wild-type eye color but sable-colored bodies. When F1 males and females were mated to each other, the F2 was composed of: 216 females with wild-type eyes and wild-type bodies 223 females with wild-type eyes and sable bodies 191 males with...
In Drosophila, purple eyes (pr) are recessive to wild type red eyes (pr+), and forked bristles (1) are recessive to wild type bristles (fº). A pure breeding purple eyed, forked bristled fly was mated to a pure breeding red eyed, wild type bristled fly. The resulting F1s were crossed to true breeding purple eyed, forked bristled fly, and the following offspring were observed: 322 red eyed, wild type bristles 318 purple eyed, forked bristles 78 red eyes, forked bristles 82...
In Drosophila, purple eyes (pr) are recessive to wild type red eyes (pr+), and forked bristles (f) are recessive to wild type bristles (f+). A pure breeding purple eyed, forked bristled fly was mated to a pure breeding red eyed, wild type bristled fly. The resulting F1s were crossed to true breeding purple eyed, forked bristled fly, and the following offspring were observed: 322 red eyed, wild type bristles 318 purple eyed, forked bristles 78 red eyes, forked bristles 82...
Problem 1 The data set below summarizes progeny (F2 generation) resulting from a cross between two F individuals, originating from a cross of two true breeding Drosophila strains (P generation), which differ with respect to two traits. Produce a hypothesis about the mode of inheritance of the genes and analyze whether the data fits your hypothesis by using the Chi-square test A1 wild type, females 334 purple eyes, females 98 purple eyes, tan body, males 47 wild type, males 161...
Mapping genes with recombination frequencies in Drosophila 1. Suppose you know of three linked loci on the Drosophila X chromosome (a, b, and c). Assume that you are starting out with true-breeding stocks that show all three recessive traits and true-breeding stocks that show all three dominant traits. A. If you wanted to do a 3-point test cross to map the three loci, how would you set up the cross? What genotypes do you use for males and females in...
A female fruit fly with vermilion eyes and normal wings is crossed to a male with normal red eyes and cut wings. The F1 progeny consist of females with red eyes and normal wings, and males with vermilion eyes and normal wings. When the F1 progeny are interbred, the F2 consists of two types of females vermilion eyes, normal wings (1/2) and red eyes, normal wings (12), and two types of males-vermilion eyes, normal wings (12) and red eyes, cut...
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