**How Do You Figure Ratios** – We use cookies to do the best. By using our website, you agree to our cookie policy. Cookie settings

This article was co-authored by Grace Imson, MA. Grace Imson is a math teacher with over 40 years of teaching experience. Grace is currently a mathematics instructor at City College of San Francisco and previously studied in the mathematics department at Saint Louis University. She has taught math in elementary, middle, high school, and college. She earned a master’s degree in education with a concentration in administration and supervision from Saint Louis University.

## How Do You Figure Ratios

Ratios are mathematical expressions that compare two or more numbers. They can compare absolute amounts and quantities, or be used to compare parts of a larger whole. Ratios can be calculated and written in many ways, but the principles that guide the use of ratios are universal.

#### How To Calculate Ratios In R

This article was co-authored by Grace Imson, MA. Grace Imson is a math teacher with over 40 years of teaching experience. Grace is currently a mathematics instructor at City College of San Francisco and previously studied in the mathematics department at Saint Louis University. She has taught math in elementary, middle, high school, and college. She earned a master’s degree in education with a concentration in administration and supervision from Saint Louis University. This article has been viewed 2,968,624 times.

To calculate a ratio, start by determining which 2 quantities are being compared to each other. For example, if you want to find the ratio of girls to boys in a class of 5 girls and 10 boys, you compare 5 to 10. Then put a colon or the word “to” between the numbers to express them as a ratio. In this example, you should write “5 to 10” or “5:10”. Finally, if possible, simplify the ratio by dividing both numbers by the highest common factor. Scroll down to learn how to solve equations and word problems with proportions! We use cookies to do the best. By using our website, you agree to our cookie policy. Cookie settings

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### Cash Ratio Formula (definition, Examples, And More)

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In mechanical engineering, a gear ratio is a direct measure of the ratio of the rotational speeds of two or more interlocking gears. Generally, with two gears, if the driven gear (receiving torque directly from the engine, motor, etc.) is larger than the driven gear, the driven gear will rotate faster and vice versa. We can express this basic concept using the formula gear ratio = T2/T1, where T1 is the number of teeth in the first gear and T2 is the number of teeth in the second gear.

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#### The Two Figures Are Similar. Find The Ratio (small To Large)

To set the gear ratio of a 2-speed gearbox, start by setting the gears. The gear attached to the motor shaft is considered the first gear, or “drive gear,” and the other gear, whose teeth mesh with the drive gear, is the second gear, or “drive gear.” Calculate the gear ratio and the number of gears in the gear. Then divide the number of teeth on the drive pinion by the number of teeth on the drive pinion to get the gear ratio. For example, if the drive gear has 20 teeth and the driven gear has 30 teeth, the gear ratio is 1.5. If you want to know how to use the number of gears to calculate gear speed, read on! The relationship between the proportions of offspring that inherit certain traits or combinations of traits is called the phenotypic ratio. This ratio is usually obtained by performing a test cross and using information from that cross to indicate how often a trait or combination of traits will be exhibited given the genotype of the offspring.

See examples of test crosses and phenotypes here: What is the key to recognizing codominance? Join our forum. Learn more!

Quantitative association of phenotypes showing how the frequency of one phenotype is related to another

### What Is An Aspect Ratio, And How Do You Determine It?

. When a researcher wants to get gene expression across generations of an organism, they use the phenotypic ratio obtained from a test cross.

Test crossing is a technique used in genetics to discover and obtain the possible phenotypes and genotypes of the offspring of organisms. An organism’s genotype is its genetic makeup; It shows the alleles and genes that a particular organism carries. When genes and alleles are expressed in observable characteristics, it is considered a phenotype. Phenotypes can be eye color, height or even hair texture. Genotypes can be used to determine the phenotypes of the progeny of organisms in test crosses, and thus a phenotypic relationship can be obtained.

For example, if a red and blue insect mate, their offspring may be red, blue, or purple (a mixture of both colors). To determine the number of times a particular phenotype is observed relative to another phenotype, we need to find the phenotypic ratio. In simple terms, the phenotypic ratio can help us determine the probability of a bug being blue, red, or purple.

## Gearing Ratios: Definition, Types Of Ratios, And How To Calculate

The phenotypic ratio is the probability of an observed trait crossing over. Phenotypic ratios are easily determined using Punnett squares or a phenotypic ratio calculator. Compare: genotypic ratio

How to calculate the phenotypic ratio. To find the phenotypic relationship, we look at the alleles of the parent organisms and estimate how often those genes will be expressed by the offspring. For the most part, we know what the alleles will express and what they will look like. Phenotypic ratios are easily determined using Punnett squares or a phenotypic ratio calculator.

In order to use the phenotypic ratio formula, a frequency plot must first be used – this can be created if it does not exist before the information given. Identify each attribute you want and organize them into columns. Then count the number of individuals with specific symptoms, making sure that only one organism is included at a time. The frequencies will be sorted from lowest to highest. Each frequency will be divided by the lowest possible frequency and the answer will be noted in a separate column of the table. These responses will be rounded and used as phenotypic ratios. For example, in Table 1 below, the final phenotypic ratio would be 9:3:1 where

### Determine The Tensions T2 And T1 In The Strings As Shown In Figure

Table 1. Shown is a frequency table for brown, black, and red hair traits and how to calculate their phenotypic ratio. Source: Josie-Anne Le Blanc of Biology Online

When both parental phenotypes are expressed, this is called codominance. Learn more about it here: What is the key to recognizing codominance? Join our forum now!

One can use a phenotypic ratio calculator that has been developed for specific crosses or use a Punnett square. Many times the calculations can be complicated because phenotypes occur when multiple alleles combine. However, these examples will be done using a single allele that will produce only one trait.

#### Financial Ratios Calculations

Crossing and subsequent generations. We can also identify differential effects for those subsequent generations. Early horse and dog breeders learned to breed animals with different characteristics without knowing the details of genetics known today. This method of selective breeding has brought many breeds of animals into our world today.

The phenotypic ratio is 1:1 when there are only two possible phenotypes when crossing organisms and there is a 50/50 chance of both occurring.

This occurs when two heterozygous parents pass one allele each to their offspring, creating two possible phenotypes, although there may be multiple genotypes. It is important to note that genotypic and phenotypic relationships will not always be the same. Figures 1 and 2 show examples of 1:1 and 3:1 phenotypic ratios in a Punnett square, respectively.

#### In The Figure, Line Pq|| Side Bc Then Write The Ratio In Which Sides Ab And Ac Are Divided Proportionately. Also Give Your Reason

The next section will present various examples of phenotypic relationships that are more complex. This will include monohybrid, dihybrid and trihybrid crosses.

A monohybrid cross occurs between two parents that are both homozygous and therefore produce only one phenotype in their offspring. It can also occur when the genotypes of both parents are completely dominant or completely recessive, producing the opposite phenotype for certain genetic traits. This can be easily determined using a Punnett square.

In Figure 3 below we see a monohybrid cross. In this example, AA, the male parent, has phenotype a