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Genetics: Heredity and Punnett Squares
Transcript of Genetics: Heredity and Punnett Squares
A Punnett Square is a chart
that shows all the possible
combinations of alleles that
can result from two parents.
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.
Step 3: Copy the left hand side alleles into the boxes on the right.
Step 4: Copy the top row of alleles into the boxes beneath them.
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.