Download Chapter 5 Heredity & Genetics

Survey
yes no Was this document useful for you?
   Thank you for your participation!

* Your assessment is very important for improving the work of artificial intelligence, which forms the content of this project

Document related concepts

List of types of proteins wikipedia, lookup

Mitosis wikipedia, lookup

Cytokinesis wikipedia, lookup

Meiosis wikipedia, lookup

Chromosome wikipedia, lookup

Amitosis wikipedia, lookup

JADE1 wikipedia, lookup

Cellular differentiation wikipedia, lookup

Cell growth wikipedia, lookup

Cell cycle wikipedia, lookup

Transcript
IV. Source of Gene Variations: When cells divide
each DNA molecule in the cell makes exact
copies of itself. But sometimes the cell makes a
mistake; bases may pair up incorrectly. The
codon are changed the altered gene is passed
on to the new cell.
A- Mutation is any permanent change in
the DNA of a cell.
1. Mutation increases with the exposure of
DNA to some chemicals ands radiation that
damage the DNA molecule.
B. Chromosome Mutation: When a piece of
chromosome breaks and are rearranged or
lost. During meiosis chromosomes mutation
may occur when chromosomes do not separate
evenly.
1. Muscular Dystrophy= Weak muscles.
2. Down Syndrome or Trisomy 21= is caused as a
result of a sex cell having too many 21st
chromosomes. The fertilized egg, contains three
21st chromosomes instead of two.
3. Importance of Mutations= are a source of new
traits or new forms of traits.