Biology genetrics

Study of heredity (passing of traits from parent to child) and variation in organisms.

• a characteristic of an organism
• (ex: eye color, height)

Parents producing offspring (children) with all of the same traits as the parents

When two different species mate. (example - When a horse and donkey mate, they make a mule, which is a hybrid

The presence of ONE dominant gene is enough for the trait to show. It covers up the recessive trait.

TWO identical recessive genes are necessary for the recessive trait to show. It covers up the recessive trait.

helps determine a trait

Alternative forms of a single gene (ex: one gene controls eye color. One allele may be for blue eyes and another allele may be for green eyes.)

The seperation of paired alleles during meiosis so that members of each pair of alleles appear in different gametes. (A gamete is an egg or sperm)

An egg or sperm

The chance of something happening (ex: The chance that a couple's daughter will be color blind.)

Used to figure out the outcome of a cross between 2 individuals.

Having identical alleles for a gene (Ex: An individual has two alleles BOTH for blue eyes.)

Having different alleles for a gene. (ex: An individual has two alleles, one for green eyes and one for blue eyes.)

Is what an organism looks like, what you can see.

combination of alleles that determine the phenotype. You CANNOT see the gen