Punnett Squares the basics

Wednesday, November 16, 2016

In this video recording,I review how to create and solve Punnett squares.
The Punnett square is a diagram that is employed to predict an outcome of a specific cross of plants or animals. Reginald C. Punnett devised the methodology. The diagram is employed by biologists to look for the possibility of an offspring having a specific genotype.
To be able to solve a Punnett square let's review some basic vocabulary.
Trait A feature that may be transmitted from one era to another.
A good example of a trait would be skin color.
An allele is another form of the same trait.
Having different eyes color would be a good example of an allele.
Homozygous dominant would be written with two capital letters.
A dominant trait is written with a capital letter.
A Homozygous recessive is written with two lower case letters.
The only way a recessive trait appears is if you have two lower case letters.
Finally, a heterozygous genotype has two different letters.

The steps for establishing a Punnett square are the following.

  • Draw the Punnett Square.
  • Write the genotype of the parents at the top and on the sides of the Punnett square.
  • Finally, complete the boxes.

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