Punnett Square Biology EOC Review

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.

Front

What does it mean for an allele to be dominant?

Back

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

Front

What does it mean for an allele to be recessive?

Back

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

Front

What is the genotype for a heterozygous organism?

Back

A heterozygous organism has two different alleles for a particular gene, represented as 'Aa'.

Front

What is the genotype for a homozygous organism?

Back

A homozygous organism has two identical alleles for a particular gene, represented as 'AA' or 'aa'.

Front

What is codominance in genetics?

Back

Codominance occurs when both alleles in a heterozygous organism are fully expressed, resulting in a phenotype that shows both traits.

Front

What is the phenotypic ratio in a typical monohybrid cross?

Back

The phenotypic ratio in a typical monohybrid cross is 3:1 for dominant to recessive traits.

Front

What is the significance of the F1 generation in genetics?

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The F1 generation is the first filial generation, produced by crossing two parental (P) generation organisms.

Front

What is the significance of the F2 generation in genetics?

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The F2 generation is the second filial generation, produced by crossing two F1 generation organisms.

Front

How do environmental factors influence gene expression?

Back

Environmental factors can affect gene expression by altering the activity of genes, leading to changes in phenotype.