Answered: Another cross in Drosophila involved…

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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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-eye traits. The cross was carried to an F2
progeny, and only male offspring were tallied. On the basis of the
data shown here, a genetic map was constructed.
Phenotype Male Offspring
y + ct 9
+ w + 6
y w ct 90
+ + + 95
+ + ct 424
y w + 376
y + + 0
+ w ct 0 (a) Diagram the genotypes of the F1 parents.
(b) Construct a map, assuming that white is at locus 1.5 on the
X chromosome.
(c) Were any double-crossover offspring expected?
(d) Could the F2 female offspring be used to construct the map?
Why or why not?

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