4-16 developmental genetics of drosophila ii

4-16 developmental genetics of drosophila ii - DEVELOP...

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Unformatted text preview: DEVELOP MENTAL GENET ICS OF DROSOPH I LA , PART I I Reading provided & Klug pg. 224-226 9.5 I n Maternal Effect, the Maternal Genotype Has a Strong I nfluence during Early Development- maternal effect : implies that an offspring’s phenotype for a particular trait is under the control of the nuclear gene products present in the egg-in cases of maternal effect, the genetic info of the female gamete is transcribed, and the genetic products (either proteins or yet untranslated mRNAs) are present in the egg cytoplasm. Following fertilization, these products influence patterns or traits established during early development.-one example of a maternal effect is seen in the moth Ephestia kuehniella . The wild-type larva has pigmented skin and brown eyes as a result of the dominant gene A. A mutation, a, interrupts the synthesis of the pigment molecule kynurenine and when homozygous, may result in red eyes and little pigmentation in larvae. However, results of the cross Aa x aa depends on which parent carries the dominant gene:...
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This note was uploaded on 09/02/2009 for the course BIO 315H taught by Professor Payne during the Spring '08 term at University of Texas.

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4-16 developmental genetics of drosophila ii - DEVELOP...

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