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an F2 generation. If there are a total of 200 F2 flies, how many of the F2 females are expected to have short bristles? a) 0 b) 50 c) 75 d) 100 e) 150 Wild type fruit flies have grey bodies and straight wings. Yellow bodies and curly wings are both recessive phenotypes. The body color gene is X-linked; the wild type allele is designated XY+. The wing shape gene is autosomal; the wild type allele is designated C+. You cross a pure breeding yellow-bodied, curly-winged female with a grey-bodied, straight-winged male to produce an F1 generation. Use this information to answer questions X-Y below. You cross two F1 flies to produce an F2 generation. What proportion of the F2 female flies are expected to have curly wings and yellow bodies? a) 1/16 b) 1/4 c) 1/8 d) 3/8 e) 3/16

an F2 generation. If there are a total of 200 F2 flies, how many of the F2 females are expected to have short bristles? a) 0 b) 50 c) 75 d) 100 e) 150 Wild type fruit flies have grey bodies and straight wings. Yellow bodies and curly wings are both recessive phenotypes. The body color gene is X-linked; the wild type allele is designated XY+. The wing shape gene is autosomal; the wild type allele is designated C+. You cross a pure breeding yellow-bodied, curly-winged female with a grey-bodied, straight-winged male to produce an F1 generation. Use this information to answer questions X-Y below. You cross two F1 flies to produce an F2 generation. What proportion of the F2 female flies are expected to have curly wings and yellow bodies? a) 1/16 b) 1/4 c) 1/8 d) 3/8 e) 3/16

Human Anatomy & Physiology (11th Edition)
Human Anatomy & Physiology (11th Edition)
11th Edition
ISBN:9780134580999
Author:Elaine N. Marieb, Katja N. Hoehn
Publisher:Elaine N. Marieb, Katja N. Hoehn
Chapter1: The Human Body: An Orientation
Section: Chapter Questions
Problem 1RQ: The correct sequence of levels forming the structural hierarchy is A. (a) organ, organ system,...
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**Educational Biology Exercise on Drosophila Genetics** **A.** 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? Options: a) 0 b) 50 c) 75 d) 100 e) 150 **Answer:** a) 0 **B.** Wild type fruit flies have grey bodies and straight wings. Yellow bodies and curly wings are both recessive phenotypes. The body color gene is X-linked; the wild type allele is designated X++ . The wing shape gene is autosomal; the wild type allele is designated C+. You cross a pure breeding yellow-bodied, curly-winged female with a grey-bodied, straight-winged male to produce an F1 generation. Use this information to answer questions X-Y below. You cross two F1 flies to produce an F2 generation. What proportion of the F2 female flies are expected to have curly wings and yellow bodies? Options: a) 1/16 b) 1/4 c) 1/8 d) 3/8 e) 3/16 **Answer:** c) 1/8
Transcribed Image Text:**Educational Biology Exercise on Drosophila Genetics** **A.** 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? Options: a) 0 b) 50 c) 75 d) 100 e) 150 **Answer:** a) 0 **B.** Wild type fruit flies have grey bodies and straight wings. Yellow bodies and curly wings are both recessive phenotypes. The body color gene is X-linked; the wild type allele is designated X++ . The wing shape gene is autosomal; the wild type allele is designated C+. You cross a pure breeding yellow-bodied, curly-winged female with a grey-bodied, straight-winged male to produce an F1 generation. Use this information to answer questions X-Y below. You cross two F1 flies to produce an F2 generation. What proportion of the F2 female flies are expected to have curly wings and yellow bodies? Options: a) 1/16 b) 1/4 c) 1/8 d) 3/8 e) 3/16 **Answer:** c) 1/8
Expert Solution
Step 1: Explaining autosomal and X linked inheritance

A character is autosomal linked when the gene is present on autosomes and the character is X linked when the genes are present on the X chromosome.

The genes can be chosen this way - 

XLXL x XlY

XLXl, XLXL - long bristle female

XlXl - short bristle female

XLY - long bristle male 

XlY - short bristle male

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