Genetics: From Genes to Genomes, 5th edition
5th Edition
ISBN: 9780073525310
Author: Leland H. Hartwell, Michael L. Goldberg, Janice A. Fischer, Leroy Hood, Charles F. Aquadro
Publisher: McGraw-Hill Education
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Textbook Question
Chapter 2, Problem 27P
In the fruit fly Drosophila melanogaster, the following genes and mutations are known:
Wing size: recessive allele for tiny wings t; dominant allele for normal wings T.
Eye shape: recessive allele for narrow eyes n; dominant allele for normal (oval) eyes N.
For each of the four following crosses, give the genotypes of each of the parents.
| Male | Female | |||||
| Wings | Eyes | Wings | Eyes | Offspring | ||
| 1 | Tiny | Oval | X | Tiny | Oval | 78 tiny wings, oval eyes |
| 24 tiny wings, narrow eyes | ||||||
| 2 | Normal | Narrow | X | Tiny | Oval | 45 normal wings, oval eyes |
| 40 normal wings narrow eyes | ||||||
| 38 tiny wings, oval eyes | ||||||
| 44 tiny wings narrow eyes | ||||||
| 3 | Normal | Narrow | X | Normal | Oval | 35normal wings oval eyes |
| 29 normal wings, narrow eyes | ||||||
| 10 tiny wings, oval eyes | ||||||
| 11 tiny wings, narrow eyes | ||||||
| 4 | Normal | Narrow | X | Normal | Oval | 62 normal wings, oval eyes |
| 19 tiny wings, oval eyes | ||||||
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In the fruit fly Drosophila melanogaster, the following genes and mutations are known:Wing size: recessive allele for tiny wings t; dominantallele for normal wings T.Eye shape: recessive allele for narrow eyes n;dominant allele for normal (oval) eyes N.For each of the four following crosses, give thegenotypes of each of the parents.Male FemaleWings Eyes Wings Eyes Offspring1 tiny oval × tiny oval 78 tiny wings, oval eyes24 tiny wings, narrow eyes2 normal narrow × tiny oval 45 normal wings, oval eyes40 normal wings, narrow eyes38 tiny wings, oval eyes44 tiny wings, narrow eyes3 normal narrow × normal oval 35 normal wings, oval eyes29 normal wings, narrow eyes10 tiny wings, oval eyes11 tiny wings, narrow eyes4 normal narrow × normal oval 62 normal wings, oval eyes19 tiny wings, oval eyes
Miniature wings (Xm) in Drosophila result from an X-linked allele that is recessive to
the allele for long wings (X*). Give the genotypes of the parents in the following
cross:
Male parent
Female parent
Male offspring
Female offspring
Long
Miniature
750 miniature
761 long
O male: X* / X* and female X™ /x+
O male: X*/Xt and female Xm /xm
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In Drosophila melanogaster, red eyes are dominant over white and the variation for this characteristic is on the X chromosome. Vestigial wings (v) are recessive to normal (V) for an autosomal gene. Predict the appearance of offspring of the following crosses: XW/XwV/v×Xw/Y v/v, Xw/XwV/v×XW/Y V/v.
Chapter 2 Solutions
Genetics: From Genes to Genomes, 5th edition
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