Using Punnett Squares

Offspring inherit the genes for specific traits from your parents.

You are watching: What is true of someone with a genotype tt

Genes because that a certain trait generally come in pairs.

Since each parent usually has 2 alleles because that a single trait, we use a Punnett square to determine the possibilities of the combine of alleles the the offspring may receive.

A Punnett square is a tool used to predict the ratio or portion of the possible genes the an offspring will have based on the genes of the parent.

In a Punnett square, the peak of the table reflects the alleles noted by one parent.

The alleles for the various other parent are placed along the left next of the table.

One allele from each parent is placed in the individual squares, creating a brand-new gene pair.

For example, the adhering to table shows the overcome Tt x tt:

t t





In this example, tallness (T) is the leading trait and shortness (t) is the recessive trait.

As the Punnett square shows, TT, Tt, and also tt space all possible genotypes for the height of the offspring.

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The offspring v the genotypes TT and Tt will have actually a phenotype that tall; the offspring with the genotype that tt will have a phenotype the short.

If the two alleles room the same (TT or tt), the genotype is taken into consideration purebred. If the 2 alleles are various (Tt), the genotype is thought about hybrid.

This instance shows the inheritance that a solitary characteristic (height). A overcome that mirrors the inheritance of a solitary characteristic is well-known as a monohybrid cross.

it is sometimes complicated to predict specific traits in people (for example hair shade or eye color) because there may be number of genes that control these traits.
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