Answered: In considering the formation of the A–P…

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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In considering the formation of the A–P and D–V axes in
Drosophila, we noted that, for mutations such as bcd,
homozygous mutant mothers uniformly produce mutant offspring with segmentation defects. This outcome
is always true regardless of whether the offspring themselves are bcd+/bcd or bcd/bcd. Some other maternaleffect lethal mutations are different, in that the mutant
phenotype can be “rescued” by introducing a wild-type
allele of the gene from the father. In other words, for
such rescuable maternal-effect lethals, mut+/mut animals are normal, whereas mut/mut animals have the mutant defect. Explain the difference between rescuable
and nonrescuable maternal-effect lethal mutations.

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