BIOLOGY-TEXT
BIOLOGY-TEXT
5th Edition
ISBN: 9781260169621
Author: BROOKER
Publisher: MCG
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Chapter 20.2, Problem 3CC
Summary Introduction

To determine: The phenotype of Drosophila if the Antp gene was expressed where the abd-A gene was supposed to be expressed.

Introduction: A homeotic gene is a gene that regulates the fate of certain areas of an animal’s body. The Drosophila species has eight homeotic genes, which are present on the same chromosome but are grouped into two complexes: the Antennapedia complex and the bithorax complex.

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Match the following some are  redundant please explain why?: Axis specification Pattern formation Genes encoding Nodal signnaling pathway members. Achondroplasia A gene which when present on th X chromosome due to a translocation cause 46, XX Differences in sex development. Organogenesis A family of genes which are found in 4 clusters of several related genes on the hiuman chromosomes . Genes which are found on the chromosomes in the same order as their expression pattern along with anterior-posterior axis in the early vertebrate embryo.   HOX genes SOX9   SRY   Cells moving and changing shape to form the alveoli of the developing lung   Mutations in these genes can cause congenital heart defects PAX6 Establishing which cells will later become each of the different parts of the eye Establishing which cells in the early embryo will develop into the front or the back A condition caused by mutations in a gene encoding a FGF receptor Pax genes
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True or false about the following statements on Drosophila eye development     a. Hh, which is expressed by the developing photoreceptors in the posterior eye disc, induces cells in the morphogenetic furrow (MF) to express DPP, which is the ligand of DPP (BMP) signaling.        b. Wg inhibits while Hh and DPP promote the expression of Eya in the preproneural (PPN) domain anterior to the MF, which is essential for the induction of photoreceptor differentiation and movement of MF from posterior to anterior. c. Eya (Eyes absent), sine oculis (so), Ey (Eyeless), and Eyg (Eygone) are the retinal determination (RD) network genes required for retinal determination and induction of atonal expression.   d. EGFR signaling is required for the differentiation of all the photoreceptor neurons. In addition EGFR signaling is also required for maintaining cell survival in posterior eye discs. e. During Drosophila eye development, cell proliferation in the second mitotic wave is required to provide…
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