Punnett Squares

Front

What is a Punnett Square?

Back

A Punnett Square is a diagram used to predict the genetic makeup of offspring from two parents based on their genotypes.

Front

Why do scientists use Punnett Squares?

Back

To determine possible genotypes for offspring.

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What does 'homozygous' mean?

Back

Homozygous refers to having two identical alleles for a particular gene, such as 'AA' or 'aa'.

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What does 'heterozygous' mean?

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

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What is a dominant allele?

Back

A dominant allele is an allele that expresses its trait even when only one copy is present in the genotype.

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What is a recessive allele?

Back

A recessive allele is an allele that only expresses its trait when two copies are present in the genotype.

Front

If 'G' represents green skin and 'g' represents brown skin, what is the genotype for a frog with brown skin?

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The genotype for a frog with brown skin is 'gg'.

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What is the probability of offspring having a dominant trait if both parents are heterozygous?

Back

The probability is 75%.

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What is the genotype of a homozygous dominant individual?

Back

The genotype of a homozygous dominant individual is represented as 'AA'.

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What is the genotype of a homozygous recessive individual?

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The genotype of a homozygous recessive individual is represented as 'aa'.