Genetics: Punnett Square

Front

What is a Punnett Square?

Back

A Punnett Square is a diagram used to predict the outcome of a genetic cross by showing the possible combinations of alleles from the parents.

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What does 'heterozygous' mean?

Back

Heterozygous refers to having two different alleles for a particular gene, such as Tt.

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What does 'homozygous' mean?

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Homozygous refers to having two identical alleles for a particular gene, such as TT or tt.

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What is a phenotype?

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Phenotype is the observable physical or biochemical characteristics of an organism, determined by its genotype.

Front

What is a genotype?

Back

Genotype is the genetic makeup of an organism, representing the alleles it carries.

Front

What is the expected phenotype ratio from a cross between two heterozygous plants (Tt x Tt)?

Back

The expected phenotype ratio is 75% tall (T) and 25% short (t).

Front

What is the expected genotype ratio from a cross between two heterozygous plants (Tt x Tt)?

Back

The expected genotype ratio is 25% homozygous dominant (TT), 50% heterozygous (Tt), and 25% homozygous recessive (tt).

Front

If a tall plant (Tt) is crossed with a short plant (tt), what is the expected phenotype of the offspring?

Back

The expected phenotype is 50% tall and 50% short.

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What is the result of crossing two homozygous white flowers (rr x rr)?

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The result is 100% white flowers.

Front

What is the expected phenotype ratio from a cross between a heterozygous white rabbit (Bb) and a homozygous black rabbit (BB)?

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The expected phenotype ratio is 50% white and 50% black.