10. The genes Stubble (Sb), Lyra (Ly), and bright (br) are all linked on chromosome 3 in Drosophila fruit flies. An organism that was heterozygous for all three genes was mated to an organism that was homozygous recessive for all three. The following phenotypes were seen in the offspring: All wild-type 422 Lyra and Stubble 4 Stubble and bright 16 Lyra and bright 75 Lyra only 18 Stubble only 59 Bright only 2 Lyra, Stubble, and bright 404 f. What are the alleles in the parental gametes? g. What are the alleles in the double crossover gametes? h. What gene is in the middle of the three? i. Draw a genetic map of the Stubble, Lyra, and bright genes and label the map distance between them.

10. The genes Stubble (Sb), Lyra (Ly), and bright (br) are all linked on chromosome 3 in Drosophila fruit flies. An organism that was heterozygous for all three genes was mated to an organism that was homozygous recessive for all three. The following phenotypes were seen in the offspring: All wild-type 422 Lyra and Stubble 4 Stubble and bright 16 Lyra and bright 75 Lyra only 18 Stubble only 59 Bright only 2 Lyra, Stubble, and bright 404 f. What are the alleles in the parental gametes? g. What are the alleles in the double crossover gametes? h. What gene is in the middle of the three? i. Draw a genetic map of the Stubble, Lyra, and bright genes and label the map distance between them.

Biology: The Unity and Diversity of Life (MindTap Course List)

14th Edition

ISBN:9781305073951

Author:Cecie Starr, Ralph Taggart, Christine Evers, Lisa Starr

Publisher:Cecie Starr, Ralph Taggart, Christine Evers, Lisa Starr

Chapter14: Chromosomes And Human Inheritance

Section: Chapter Questions

Problem 3GP: Human females have two X chromosomes (XX); males have one X and one Y chromosome (XY). a. With...

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Human females have two X chromosomes XX; males have one X and one Y chromosome XY. a. With respect to X-linked alleles, how many different types of gametes can a male produce? b. A female homozygous for an X-linked allele can produce how many types of gametes with respect to that allele? c. A female heterozygous for an X-linked allele can produce how many types of gametes with respect to that allele?
Human females have two X chromosomes (XX); males have one X and one Y chromosome (XY). a. With respect to X-linked alleles, how many different types of gametes can a male produce? b. If a female is homozygous for an X-linked allele, how many types of gametes can she produce with respect to that allele? c. If a female is heterozygous for an X-linked allele, how many types of gametes can she produce with respect to that allele?
2. a. A Drosophila male from a true-breeding stockwith scabrous eyes was mated with a female from atrue-breeding stock with javelin bristles. Both scabrous eyes and javelin bristles are autosomal recessive mutant traits. The F1 progeny all had normaleyes and bristles. F1 females from this cross weremated with males with both scabrous eyes andjavelin bristles. Write all the possible phenotypicclasses of the progeny that could be produced from the cross of the F1 females with the scabrous, javelin males, and indicate for each class whether it is arecombinant or parental type.b. The cross in part (a) yielded the following progeny:77 scabrous eyes and normal bristles; 76 wild type(normal eyes and bristles); 74 normal eyes andjavelin bristles; and 73 scabrous eyes and javelinbristles. Are the genes governing these traits likelyto be linked, or do they instead assort independently? Why?c. Suppose you mated the F1 females from the crossin part (a) to wild-type males. Why would thiscross fail…
n the fruit fly, Drosophila melanogaster, a spineless (sp, no wing bristles) female fly is mated to a male that is claret (cl, dark eyes) and hairless (h, no thoracic bristles). Phenotypically wild type F1 female progeny were mated to fully homozygous (mutant) males and the following progeny (1000 total) were observed. PHENOTYPES NUMBER OBSERVED spineless 266 wild 181 claret, spineless 18 claret 37 claret, hairless 264 hairless, claret, spineless 189 hairless 12 hairless, spineless 33…
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