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Genetics: Heredity and Punnett Squares

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by

Brooke Baldwin

on 20 October 2014

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Transcript of Genetics: Heredity and Punnett Squares

Genetics: Heredity and Punnett Squares
Punnett Squares
A Punnett Square is a chart
that shows all the possible
combinations of alleles that
can result from two parents.
Genetics
The scientific study of heredity.
Genes and Alleles
Genes: The word scientists use for the factors that control a trait.
Alleles: The different forms of a gene.
Dominant vs. Recessive
Dominant alleles are the traits that will always show up when present in the organim.

Dominant alleles are always written with a capital letter.
What is Heredity?
Heredity is the passing of physical traits from parents to offspring.
A trait is a characteristic that is passed to an organism's offspring through its genes.

How to Use a Punnett Square
Step 1: Draw a box and divide it into four squares.
Step 2: Write the parents' alleles at the top and along the left side of the squre.
R r
R
r
Step 3: Copy the left hand side alleles into the boxes on the right.
R r
R R
R
r
r r
Step 4: Copy the top row of alleles into the boxes beneath them.
R r
R
r
R R
r r
R r
R r
You have now completed your Punnett Square.

The Punnett Square will now show you the probability of an offspring having a certain trait.
The recessive allele is the allele that is weaker and is hidden by the dominant allele.
The recessive will only show through if the dominant allele is absent.
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