Genetics & Punnett Squares

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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.

Tags

NGSS.HS-LS4-3

Front

What does it mean for a trait to be dominant?

Back

A dominant trait is one that will appear in the offspring if at least one parent contributes the dominant allele.

Front

What does it mean for a trait to be recessive?

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A recessive trait is one that will only appear in the offspring if both parents contribute the recessive allele.

Tags

NGSS.HS-LS3-1

Front

How are dominant alleles represented?

Back

Dominant alleles are represented by uppercase letters.

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How are recessive alleles represented?

Back

Recessive alleles are represented by lowercase letters.

Front

What is the genotype for a homozygous dominant individual?

Back

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

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What is the genotype for a homozygous recessive individual?

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

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What is the genotype for a heterozygous individual?

Back

The genotype for a heterozygous individual is represented as 'Aa'.

Front

What is the probability of an offspring being homozygous dominant from a cross of two heterozygous parents (Aa x Aa)?

Back

The probability is 25%.

Tags

NGSS.HS-LS3-3

Front

What is the probability of an offspring being heterozygous from a cross of two heterozygous parents (Aa x Aa)?

Back

The probability is 50%.

Tags

NGSS.HS-LS3-3