Life: The Science of Biology
11th Edition
ISBN: 9781319010164
Author: David E. Sadava, David M. Hillis, H. Craig Heller, Sally D. Hacker
Publisher: W. H. Freeman
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Chapter 12.4, Problem 6R
Summary Introduction
To review:
The linked genes from the data and the distance between them in map units.
Introduction:
Linked genes are those, which get inherited together and do not follow the normal
The cross results of three autosomal characteristics in Drosophila, namely, the body color, wings shape, and eye color are as follows:
Cross I:
Parents: Heterozygous red eye color, normal wings × sepia eye color, vestigial wings.
Offspring results:
| 131 | Red-eye color, Normal wings |
| 120 | Sepia eye color, Vestigial wings |
| 122 | Red-eye color, Vestigial wings |
| 127 | Sepia eye color, Normal wings |
Cross II:
Parents: Heterozygous gray body, normal wings × black body color, vestigial wings.
Offspring results:
| 236 | Gray body, normal wings. |
| 253 | Black body, Vestigial wings. |
| 50 | Gray body, Vestigial wings. |
| 61 | Black body, Normal wings. |
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Another cross in Drosophila involved the recessive, X-linked genes yellow (y), white (w) and cut (ct). A yellow-bodied, white-eyed female with normal wings was crossed to a male whose eyes and body were normal but whose wings were cut. The F1 females were wild type for all three traits, while the F1 males expressed the yellow-body and white eyes traits. The cross was carried to an F2 progeny and only male offspring were tallied. Based on the data shown here, a genetic map was constructed. a) Diagram the genotypes of the F1 parents. b) Construct a map, assuming the white is at locus 1.5 on the X-chromosome.
Phenotype
Male offspring
y + ct
9
+ w +
6
y w ct
90
+ + +
95
+ + ct
424
y w +
376
y + +
0
+ w ct
0
Another cross in Drosophila involved the recessive, X-linked genes yellow (y), white (w) and cut (ct). A yellow-bodied, white-eyed female with normal wings was crossed to a male whose eyes and body were normal but whose wings were cut. The F1 females were wild type for all three traits, while the F1 males expressed the yellow-body and white eyes traits. The cross was carried to an F2 progeny and only male offspring were tallied. Based on the data shown here, a genetic map was constructed. a) Diagram the genotypes of the F1 parents. b) Construct a map, assuming the white is at locus 1.5 on the X-chromosome
*******ANSWER PART B NOT PART A!!!!
Phenotype
Male offspring
y + ct
9
+ w +
6
y w ct
90
+ + +
95
+ + ct
424
y w +
376
y + +
0
+ w ct
0
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.
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