9. Which genes should be turned on first to determinate the body axis during embryogenesis of Drosophila?
(A) Pair rule genes
(B) Segmentation genes
(C) Segmentation polarity genes
(D) Maternal effect genes
(E) Homeotic genes
A gene that, when mutant in the mother, results in a mutant phenotype in the offspring, regardless of the offspring’s genotype. Maternal effect genes, also called egg-polarity genes, were first identified in Drosophila melanogaster.
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