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Heredity is basically the passage of traits from a P ( parental) generation onto its offspring. Genetics is intimately related to reproduction and a knowledge of reproduction will facilitate your learning of genetics.
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Every cell in a multicellular organism contains the same identical genome - yet in a human being there are eye cells, bone cells, and brain cells - which all serve different purposes yet genetically are identical.
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Gene expression is basically the control of the cell over which genes to make and which not to make at a specific time. Now why would a cell want to do this? The example we'll use to explore prokaryotic gene expression is the lac operon.
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Transcription is the process by which the genetic information in DNA is converted into RNA. The mechanism of transcription can be described simply in 6 steps (5 in prokaryotes):
Genetics , An Introduction

GENETICS-INTRODUCTION

Welcome to Genetics - the study of heredity. More precisely, it is the study of how living organisms inherit characteristics or traits from their ancestors. It has only been in the past one hundred years that we have begun to understand how information in the form of physical characteristics is transferred from parent to child.

GENE EXPRESSION & TRANSCRIPTION

Brain Anatomy - Human Brain Development - cortical brain

The Role of Genetics in Biology Genetics provides one of biology's unifying principles: all organisms use the same genetic system. Genetics also undergirds the study of many other biological disciplines......full story

GENES - WORKINGS & EVOLUTIONS

psychopharmacology

Every cell in a multicellular organism contains the same identical genome - yet in a human being there are eye cells, bone cells, and brain cells - which all serve different purposes yet genetically are identical......full story

DNA & RNA REVEALED

Nursery Genetics, DNA , RNA

While most genetic research uses lab organisms, test tubes and petri dishes, the results have real consequences for people. Your first encounter with genetic analysis probably happened shortly after you were born, when a doctor or nurse took a drop of blood from the heel of your tiny foot..... full story


Fact-Sheet

Fact Sheet Chromosomes

Chromosomes are thread-like structures located inside the nucleus of animal and plant cells. Each chromosome is made of protein and a single molecule of deoxyribonucleic acid (DNA). Passed from parents to offspring, DNA contains the specific instructions that make each type of living creature unique. .... full story

Image Of The Week

Cell Cross Section

Fact-Sheet

Fact-Sheet: Flourescence In Situ Hybridization FISH

Fluorescence in situ hybridization (FISH) provides researchers with a way to visualize and map the genetic material in an individual's cells, including specific genes or portions of genes. This may be used for understanding a variety of chromosomal abnormalities and other genetic mutations. ....full story

Fact-Sheet

Fact-Sheet: Genetic Mapping

Genetic mapping - also called linkage mapping - can offer firm evidence that a disease transmitted from parent to child is linked to one or more genes. Mapping also provides clues about which chromosome contains the gene and precisely where the gene lies on that chromosome. ...full story