Maternal effect

Maternal effect genes
mRNA distributions
A Drosophila oocyte is a polarized cell. The future anterior-posterior axis of the fly is established by mRNA molecules that are differentially localized within the oocyte.
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In cases of maternal effect, the transmission pattern of the alleles is the same as in standard Mendelian genetics but the action of the gene occurs a generation later.
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The genes that code for these mRNAs, called maternal effect genes, encode for proteins that get translated upon fertilization to establish concentration gradients that span the egg.
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