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Punnett squares use mathematical probability to help predict the genotype and phenotype combinations in genetic crosses. Select the steps below that describe how to construct Punnett squares.

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marianaegarciaperedo

Question:

I failed to find the options, but I will post the way by which you can construct Punnett squares.

Answer and Explanation:

First, you need to know both parental individuals´ genotypes. From these genotypes, you will get all the possible gametes for each parent, following the principle of simple segregation.

Then, by using a simple square, you will make the crosses. This is:

  • You will locate all the possible gametes of one parent on the top of the square
  • You will place all the possible gametes of the other parent on the left edge of the square.
  • Once you have done that, you will perform the crosses. You will look for the intersection between each parent´s gametes and place all the involved alleles in the intersection-box. These are the possible genotypes, and they will be written within the square.

In the attached files, you will find an example of the cross between two pure-breeding plants.

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