Like this study set? Create a free account to save it.

Sign up for an account

Already have a Quizlet account? .

Create an account


the different forms a gene may have for a trait


the genetic make-up of an organism

incomplete dominance

when both alleles are expressed in offspring, when neither allele for a trait is dominant

polygenic inheritance

occurs when a group of gene pairs acts together to produce a single trait, which creates more variety in phenotypes


when a trait covers up or dominates the other traits


the passing of traits from one generation to another

multiple alleles

when there are more than two alleles possible for a trait

gene therapy

when a normal allele is placed into a virus, which delivers the normal allele when it infects its target cell, may be used to control genetic disorders, like cystic fibrosis

genetic engineering

how scientists are experimenting to change the arrangement of DNA that makes up a gene


an organism that has two different alleles for a trait


shows patterns of genetic inheritance in a family


in a Punnett square, a small letter(t) stands for this kind of allele, the trait seems to disappear

recombinant DNA

made by inserting a useful segment of DNA from one organism into a bacterium, ex. human insulin


an organism with two alleles that are exactly the same


the way an organism looks and behaves as a result of its geneotype

sex-linked gene

an allele inherited on an X or Y chromosome, such as hemophilia or color-blindness

recessive genetic disorders

when both parents have a recessive allele responsible for the disorder and pass it to their child


(same) an organism whose two genotype alleles are exactly the same


(different) an organism with two different alleles for a trait


(many) a type of inheritance where more than one set of genes controls a trait

Gregor Mendel

the father of genetics, first to use mathematics to explain heredity and to trace one trait for generations


receives different genetic information for a trait from each parent


helps predict the chance that something will happen

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 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

Voice Recording