Chromosomes
Human body cells contain how many chromosomes
46
DNA is made of four nitogen bases. Name them.
Adenine, Thymine, Cytosine, Guanine
A mutation is what?
A small change in hereditary material
Selecting organisms with desired traits to reproduce is called what?
Selective breeding
Fossils give scientists clues about what?
Earth's past
Sex cells contain how many chromosomes compared to body cells
Half as many chromosomes
Which base is found in RNA but NOT DNA
Uracil
Some mutations are helpful because they do what?
Improve chances of survival
When two genetically different organisms are crossed, it is called what?
Hybridzation
What type of dating determines the actual age of fossils?
Radioactive dating
Who developed the chromosomes theory of inheritance
Walter Sutton
What carries genetic information from DNA to ribosomes
mRNA
A person who carries a gene for a disorder but does not show it is called what?
Carrier
Cloning produces what kind of organism
Genetically identical
What type of dating compares fossils but does NOT give exact age?
Relative dating
Genes are carried on what structures?
Chromosomes
What RNA brings amino acids to the ribosomes?
mRNA
Autosomal disorders affect which chromosomes
Chromosomes 1-22
Genetic engineering in bacteria is commonly used to produce what?
Petrified fossils form when what happens?
Minerals replace remains and turn them to rock
A disease caused by missing, extra, or defective chromosomes is called what?
Genetic disorder
What is a gene?
A section of DNA that codes for a protein
What is a chromosomal error?
A chromosome is missing or extra
What was the goal of the Human Genome Project?
Identity the DNA sequences of every human gene
What is mass extinction?
Many organisms go extinct at the same time.