Advertisement Upgrade to remove ads


a Greek philosopher who was one of the first people to classify organisms

binomial nomenclature

two word naming system developed by Linnaeus


an individual who has the gene for a genetic disorder but does not express the trait

crossing- over

the exchange of corresponding pieces of DNA between like (homologous) chromosomes


molecule that contains the information needed by a cell to direct its activities and determine its characteristics


sex cells which are produced during the process of meiosis


an organism's genetic make-up or allele combination- its "letter" code Example : Tt


first word of a scientific name

Gregor Mendel

concluded that traits (genes) are inherited through the passing of factors (genes) from parents to offspring


an organism with different alleles for a trait, represented by one upper-case letter and one lower-case letter


a chart showing pairs of chromosomes


first scientist to give species a 2-word scientific name


produces four new genetically different cells that have half the number of chromosomes that an organism's body cells have


chromosomes line up in the "middle"


a family record that shows how a trait is inherited over several generations


an organism's physical characterictics or visible trait. Example: tall

reproductive cell (sperm, egg)

contains half the chromosomes

sex-linked traits

found on the 23rd pair of chromosomes


the identification and classification of organisms

upper-case letter

used to indicate a dominate allele in Punnett squares

Please allow access to your computer’s microphone to use Voice Recording.

Having trouble? Click here for help.

We can’t access your microphone!

Click the icon above to update your browser permissions above and try again


Reload the page to try again!


Press Cmd-0 to reset your zoom

Press Ctrl-0 to reset your zoom

It looks like your browser might be zoomed in or out. Your browser needs to be zoomed to a normal size to record audio.

Please upgrade Flash or install Chrome
to use Voice Recording.

For more help, see our troubleshooting page.

Your microphone is muted

For help fixing this issue, see this FAQ.

Star this term

You can study starred terms together

NEW! Voice Recording