BioG 1105-1106 at Cornell University
more options
Unit 3: Demos

Objective 3:

Operon Tutorial
lac operon animation
Induction of the lac operon

Objectives 4 & 5:

Positive v. negative control of prokaryotic gene transcription

Objective 6:

Transcription of eukaryotic vs. prokaryotic genomes (6c)

Objective 7:

How Does Methylation Control Synthesis of Proteins?
You are what your grandmother ate - diet linked to methylation (optional)
Genetic Imprinting: The Battle of the Sexes - Reloaded (optional)
Genome biology: She moves in mysterious ways - The human X chromosome is a study in contradictions. The detailed sequence of the X, and a survey of inactivated genes in females, help to illuminate this unique 'evolutionary space'.
Unexpressed but Indispensable: The (non-coding) DNA Sequences that Control Development. (optional)

Objective 9:

optional:

Diagram showing how Dolly was made (from Liem et al. Functional Anatomy of the Vertebrates, 3rd ed.)
Give the dog a clone
ViaGen: Gene Banking and Cloning of Exceptional Pets

Objective 14:

Yolk content and cleavage in human eggs (14c)
Zygote and morula (14d):
Zygotes: sea urchin, frog (zygote upper left, morula bottom right)

Objective 16:

Notochord development (16a)
Neural crest cells (16d):
Formation and fate of neural crest cells (16d)
Scientists Hatch a Few Odd Birds  (optional)
Somite development (16e)

Objective 17:

Comparative development (17b)

Objectives 19 & 20:

Determinate v. indeterminate cleavage & embryonic induction

Slides

Unit 3 Slides (accompanying text can be found in your Survival Manual on pages 57-59.)

Comparative Development

 

Sea Urchin
Frog
Chick
Amount of yolk in egg
small
medium
large
Cleavage

holoblastic

even in animal and vegetal poles

holoblastic

faster cleavage in animal v. vegetal pole

meroblastic

cleavage restricted to animal pole

Gastrulation

invagination

see Fig. 47.9

invagination and "growing over" of proto-ectoderm

see Fig. 47.10

primitive streak

see Fig. 47.12

Neurulation
no CNS

normal pattern
see Fig. 47.11

neural plate - neural groove - neural tube invaginates

same as frog

© BIOG 1105-1106