'Hox genes' diaporamas de présentation

INVERTEBRATES About 97 percent of all animals are invertebrates.

INVERTEBRATES About 97 percent of all animals are invertebrates. Animals are characteristically multicellular heterotrophs whose cells lack cell walls Animals likely evolved from protozoans. Kingdom Protista.

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Lesson Overview

Lesson Overview. 13.4 Gene Regulation and Expression. THINK ABOUT IT . Think of a library filled with how-to books. Would you ever need to use all of those books at the same time? Of course not. Now picture a tiny bacterium that contains more than 4000 genes.

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Ch 22 Introduction

Ch 22 Introduction. How does a single fertilized egg cell develop into an embryo and then into a baby and eventually an adult? A few fundamental principles are common to all developmental sequences observed in multicellular organisms. Shared Developmental Processes.

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Transvection

Transvection. Zygotic Gene Activity in Development. The differentiation of cell types and the formation of organs depend on genes being activated in particular spatial and temporal patterns. Zygotic Gene Expression.

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Vertebrate Embryonic Patterning 6

Vertebrate Embryonic Patterning 6. Limb Formation. Tetrapod Limb. anterior. ventral. distal. proximal. dorsal. posterior. Limb Bud Formation. Establishment of Limb Fields. Hox Gene Expression in Trunk During Limb Bud Development.

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Pattern formation in drosophila

Pattern formation in drosophila. Katja Nowick TFome and Transcriptome Evolution nowick@bioinf.uni-leipzig.de. Single cell ? multicellular organism. Drosophila development. embryogenesis. 3h. Fertilized egg. 5h. Adult fly. 12d. 24h. Larva = embryo. metamorphosis.

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Regulating Gene Expression

Regulating Gene Expression. Turning Genes On and Off. Procaryotes. Procaryotes are bacteria and blue green algae They have no nucleus They have circular chromosomes made only of DNA. Procaryotes. On procaryotic chromosomes there are many genes

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Reproductive Systems

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EVOLUTION

EVOLUTION. Natural Selection. Mechanism for evolution Differential survival and reproduction of chance inherited variants, depending on environmental conditions. EVOLUTION by Natural Selection.

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Evolution Review

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Lesson Overview

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Animal gametogenesis and embryology (chapters 25, 32, 47) What is an animal?

Animal gametogenesis and embryology (chapters 25, 32, 47) What is an animal? multicellular, heterotrophic, ingest food no cell walls; organisms held together by extracellular matrix; intracellular junctions nervous and muscle tissues are unique distinctive stages of development

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Early development and aging

Early development and aging. I. Embryonic development. A. Cleavage 1. zygote to morula to blastula 2. blastocyst 3. cleavage position and fate 4. the beginning of differentiation 5. accomplishments of cleavage B. Gastrulation 1. the main events 2. 3 germ layers

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Genetics Review

Genetics Review. State what each of these scientist discovered. Frederick Griffith Oswald Avery Alfred Hershey & Martha Chase Erwin Chargaff Rosalind Franklin James Watson and Francis Crick George Beadle and Edward Tatum.

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Vertebrates

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KEY CONCEPT Animals are diverse but share common characteristics.

KEY CONCEPT Animals are diverse but share common characteristics. Animals are the most physically diverse kingdom of organisms. Animals range in size from 25-meter-long blue whales to microscopic rotifers. Animals are found nearly everywhere on Earth.

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Hox Genes (The Boss Genes)

Hox Genes (The Boss Genes). Hox Genes in Humans and Fruit Flies. http://www.thelancet.com/journals/lancet/article/PIIS0140673603141876/images?imageId=gr6&sectionType=red&hasDownloadImagesLink=true. Hox genes are highly conserved over evolutionary time.

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Hox Genes

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