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Using Probability to solve a genetic problems

Hi, I don't have a problem with the question itself but i don't understand how my textbook use probabilty in solving the problem.

How many genetically different eggs could be formed by a women with the following genotypes?

Aa bb CC DD

Now it's obvious that one gamete will have (A b C D) and the other gamete will have (a b C D)

This is the way my textbook answered it "using the product rule(because the inheritance of each gene is independent), she can make 2x1x1x1= 2 different types of gametes. Please explain

Solution Preview

Hello and thank you for posting your question to Brainmass.

Let's think about a slightly different problem from the real world. Soething all of us have done one way or another: used a combination lock (or choose a four digit PIN number)

Assume you have a combination lock with 4 placemet holders. Each place can hold a number between 0 to 9.
How many code combinations are possible?

Well, in the first place we can have 10 different options.
Next we choose a number for the second place.
Since it is independent of the first number, we again have 10 numbers to choose from.

If we set the first number ...

Solution Summary

The probability to solve a genetic problems are used. How many genetically different eggs could be formed by a women with the genotypes are determined.

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