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# How does probability help explain the results of a genetic cross?

Updated: 11/4/2022

Wiki User

13y ago

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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13y ago

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Q: How does probability help explain the results of a genetic cross?
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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.

### A genetic cross performed may times produces 798 long stemmed plants and 266 short stemmed plants The probability of obtaining a short stemmed plant in a similar cross is?

The probability of obtaining a short-stemmed plant in a similar cross would be 1/4 or 25%. This is because the ratio of short-stemmed plants to total plants is 1:4 based on the results of the genetic cross performed multiple times.

### What is used to predict the outcome of a test cross?

The punnett square which is mainly about probability of genetic crosses

punnett square

### What did mendel predict was the probability of producing a tal plant from a genetic cross of two hybrid tall piants?

Mendel predicted a 3:1 ratio for producing a tall plant from a genetic cross of two hybrid tall plants. This means that there is a 75% probability of producing a tall plant and a 25% probability of producing a short plant.

### What is the square used to determine probabillity and results of cross is called?

Square used to determine probability and results of cross is called a Punnett square. It is named after Reginald C. Punnett.

It is 1/4.

It is 1/4.

### A model that helps explain the results of Mendel's crosses is called a?

Punnett square. It is a tool used to predict the genotypes and phenotypes of offspring in a genetic cross. By combining the possible alleles from each parent, the Punnett square shows the potential genetic outcomes of their mating.

### What chart is used to predict results of genetic cross?

A Punnett square is commonly used to predict the results of a genetic cross between two individuals. This tool allows for the visualization of possible genotypes that offspring may inherit based on the genotypes of the parents.

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### How does a botanist use probiblity?

probability is used by botanists, horticulturists and geneticists to determine the probability or "chance" of genetic outcome. for example: if you cross a red flowering plant with a white flowering plant.. probability is used to calculate what chances the offspring of the crossing would be red, pink or white.