19) In Drosophila fruit flies, the gene controlling bristle length is X-linked. Wild type flies have longbristles; short bristles is a recessive trait. You cross a long-bristled female fly to a short-bristledmale fly. All the F1 progeny have a wild type phenotype. Next, you cross the F1 flies to producean F2 generation. If there are a total of 200 F2 flies, how many of the F2 females are expected tohave short bristles?V/100Wild type fruit flies have grey bodies and straight wings. Yellow bodies and curly wings are bothrecessive phenotypes. The body color gene is X-linked; the wild type allele is designated XY+. Thewing shape gene is autosomal; the wild type allele is designated C+. You cross a pure breedingyellow-bodied, curly-winged female with a grey-bodied, straight-winged male to produce an F1generation. Use this information to answer questions X-Y below.You cross two F1 flies to produce an F2 generation. You select a female F2 fly that isphenotypically wild type. What is the probability that this fly is heterozygous for both traits?a) 0b) 1/3c) 2/3d) 4/9e)

In this particular scenario, we’re examining a gene that controls bristle length, which is X-linked.…

In Drosophila fruit flies, the gene controlling bristle length is X-linked. Wild type flies have long bristles; short bristles is a recessive trait. You cross a long-bristled female fly to a short-bristled male fly. All the F1 progeny have a wild type phenotype. Next, you cross the F1 flies to produce an F2 generation. If there are a total of 200 F2 flies, how many of the F2 females are expected to have short bristles?

In Drosophila fruit flies, the gene controlling bristle length is X-linked. Wild type flies have long bristles; short bristles is a recessive trait. You cross a long-bristled female fly to a short-bristled male fly. All the F1 progeny have a wild type phenotype. Next, you cross the F1 flies to produce an F2 generation. If there are a total of 200 F2 flies, how many of the F2 females are expected to have short bristles?

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

Chapter13: Genes, Chromosomes, And Human Genetics

Section: Chapter Questions

Problem 8TYK: Another gene in Drosophila determines wing length. The dominant wild-type allele of this gene...

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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…
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