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Genetics often involves dominant and recessive alleles. For instance, blue eyes are recessive and brown eyes are dominant.1 Each parent contributes one allele. If you get two blues, then your eyes are blue. If you get one or two browns, then you eyes are brown. That means that, given a random contribution from your parents, you have a 25% probability of blue eyes.
It also means that, even though you have brown eyes, you could be carrying the blue allele, and two parents with brown eyes could have a blue eyed child.
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1Its more complicated than that, since eye color is actually polygenic, involving more than one allele. This example was simplified to answer the question.
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How are the principles of probability used to predict the outcomes of genetic crosses?
Whenever Mendel performed a cross with pea plants, he carefully categorized and counted the many offspring. Every time Mendel repeated a particular cross, obtained similar results. For example, whenever Mendel crossed two plants that were hybrid for stem height (Tt), about three fourths of the resulting plants were tall and about one fourth were short. Mendel realized that the principles of probability could be used to explain the results of genetic crosses.
From the cross AA x AA the probability of producing a homozygous dominant offspring is?
From the cross Aa x Aa, the probability of producing a homozygous dominant offspring is 1/4 or (0.25).
A genetic cross can be represented in a graph in the form of what?
A Punnet Square
How can you predict he outcome of a genetic cross?
by using a Punnett Square
In the cross AA x AA what is the probability of obtaining AA offspring?
50% will be tall
