Genetics

Process of DNA being copied before cell division occurs

Must make an exact copy or mutations will occur (which could be harmful)

The 2 strands of the DNA helix split and each side serves as a template for the other side

Called semi-conservative replication Process makes sure that information is not

loss during the replication process

Process of making proteins in the cell Follows the directions coded by the DNA Requires DNA and RNA Takes place in nucleus and ribosome Has 2 steps:

◦ Transcription◦ Translation

Transcription Translation Information from the

DNA (in the nucleus) is copied in the form of messenger RNA.

Copies only the information for the protein that needs to be made

The mRNA then leaves the nucleus and travels to the ribosome.

Decodes the information from the mRNA

Occurs in the ribosome Needs tRNA and mRNA

to make the protein correctly according to the directions that were specified in the original DNA

Genetic code for each amino acid is the same in ALL organisms.

Original DNATHE CAT ATE THE FAT RAT.

Silent MutationTHA CAT ATE THE FAT RAT

Nonsense MutationTHE CAT ATE THE.

Missense MutationTHE CAR ATE THE FAT RAT.

Frameshift MutationTHE CCA TAT ETH EFA TRA T.THC ATA TET HEF ATR AT.

DNA

Individual Nucleotide

One trait completely masks/dominants the other trait when it is expressed. Can be homozygous or heterozygous dominant

The recessive trait is seen when there are 2 copies present (homozygous recessive)

Both traits are equally dominant and neither will give in so both traits are shown.

Black Feathered Chicken

White feathered chicken

Checkered feather chicken

Traits are not dominant or recessive. The traits “blend” together to make a new color/trait.

The trait is carried on the sex –chromosome (x-chromosome) so the inheritance is different for males and females.

Males inherit one gene from mother on X

chromosome and an unaffected Y from father.

Females inherit an X from their father and an X from

their mother.

Trait controlled by 2 or more genes and produces a range of outcomes (examples: skin color, eye color, hair color, height)

More than 2 forms of a gene control the trait.

These mutations alter the composition or number of chromosomes in the organism.

Usually have severe consequences for the organism.

Usually occur during meiosis