DOMINANT AND RECESSIVE

INHERITANCE

By: Shelby J-S & Kaylin P.

GENES

Dominant genes- The trait that is normal and most

likely to appear. A dominant gene is shown by a

capital letter. ‘B’

Recessive- The trait that is different or rare but,

less likely to appear. A recessive gene is shown by a

lower case letter. ‘b’

HOW THEY MATCH UP

If a dominant gene matches up with a recessive

you get the dominant trait.

If two dominant genes match up, you still get the

dominate trait.

If two recessive genes match up you get the

recessive trait. This is the only way to get a recessive

trait.

PUNNETT SQUARE

Punnett squares are used when parents want to

find out the traits of there baby, in other words it’s a

chart that helps predict traits of off spring.

What makes up a punnett square is each parent

has two alleles to make up a trait. Each of there

traits are put on the outsides of the square and

depending on what there traits are is what the inside

of the square shows.

EXAMPLE OF PUNNETT SQUAREThe letters on the other

side of the square are the

parents, and they bot have

the dominate trait.

The letters on the inside of

the square are the traits of

the child.

They have the dominate

trait no matter what because

dominant always covers

recessive.

BB

BBBb

Bb

B B

B

b