mini test 3 Flashcards
Mutation
is any change or mistake in the genes or chromosomes
True or False. A mutatation is always a bad thing
False
2 effects of mutation
can result 2 disease and lead to death. And is impossible for organisms to survive
Benefits of mutation
Gives the organisms a sudden new advantage . And contributes to genetic variations.
Can a mutation be tranferred to your kid if its in your skin or body cells?
NO
How can a mutation be transferred to your kid?
If its in your egg cells or sperm
What causes down syndrome?
Nondisjunction
Deletions:
A chromosome segment is lost
Translocation:
When A chromosome breaks off and becomes reattached to a non-homologous chromosome
Inversion:
When A chromosome segment breaks off and becomes reattached at a new point
Duplications:
a chromosomal segment repeats
Insertion:
the addition of nucleotide pairs in a gene
substitution
a mutation in which there is a letter change. such as switching a T to a C
Every cell in our body has 46 chromosomes with
the SAME DNA
The use of the information from a gene is called
GENE EXPRESSION
Some genes are turned on and others are
turned off
why do cells have different, structures, functions, and physical characteristics?
because of gene expression
Gene expression causes different medical condtions between
Identical twins
What are some factors that determine gene expression?
Health habits and nutrition
Environmental factors
