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Questions and Answers List

Question	Answer
When cells differentiate, they ____	express a specific subset of genes
In animals, one group of homeobox genes, the Hox gene family, regulates the development and location of structures such as legs and wings along the anterior-posterior axis of the body.	True
A mutation in the Hoxc8 gene in the ancestor of modern snakes caused its descendants to have ___	no forelimbs or necks
Evolutionary studies that use comparative morphology to analyze the structures of related organisms are primarily based on comparisons of homologous traits.	True
A ____ gene determines the structure of body parts during embryonic development.	homeobox
The anterior-posterior orientation of Drosophila embryos is initially controlled by ____.	maternal effect genes
Molecular techniques have revealed that ____ caused the loss of forelimbs in snakes.	changes in the spatial pattern of Hoxc8 gene expression
Hox genes, one class of ____ genes, contain a conserved ____ region to which transcription factors containing a corresponding ____ bind.	homeobox; homeobox; homeodomain
Which structure(s) grow(s) just in front of animal tissues where only the Hoxc6 gene is expressed?	forelimbs only
Genes that encode transcription factors which control other sets of genes important in animal development are called _____	master regulatory genes