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| Modern Genetic Analysis Chapter 16. The Genetic Basis of Development Forming Complex Pattern: Establishing Positional Information Genetics In Process 16-4: Studying the BCD gradient Photomicrographs of the exoskeletons of larvae derived from wild-type and bcd maternal-effect-lethal mutant mothers. These photomicrographs are in darkfield, so dense structures appear white, as in a photographic negative. Note the bright, segmentally repeated denticle bands present on the ventral side of the embryo. Maternal genotypes and larval phenotypes (and class of mutation) are as follows: (a) wild-type, normal phenotype; (b) bcd (bicoid), anterior head and thoracic structures missing (anterior).

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