DOMINANT AND RECESSIVE INHERITANCE By: Shelby J-S & Kaylin P.
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Transcript of DOMINANT AND RECESSIVE INHERITANCE By: Shelby J-S & Kaylin P.
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